diff --git a/src/dsp/lossless.c b/src/dsp/lossless.c
index cc193bdd..f5da54ba 100644
--- a/src/dsp/lossless.c
+++ b/src/dsp/lossless.c
@@ -19,8 +19,10 @@ extern "C" {
 #include <stdlib.h>
 #include "./lossless.h"
 #include "../dec/vp8li.h"
-#include "../enc/histogram.h"
 
+#ifdef USE_LOSSLESS_ENCODER
+
+#include "../enc/histogram.h"
 
 // A lookup table for small values of log(int) to be used in entropy
 // computation.
@@ -122,6 +124,8 @@ double VP8LFastLog(int v) {
   return log(v);
 }
 
+#endif
+
 //------------------------------------------------------------------------------
 // Image transforms.
 
@@ -288,6 +292,7 @@ static const PredictorFunc kPredictors[16] = {
   Predictor0, Predictor0    // <- padding security sentinels
 };
 
+#ifdef USE_LOSSLESS_ENCODER
 // TODO(vikasa): Replace 256 etc with defines.
 static double PredictionCostSpatial(const int* counts,
                                     int weight_0, double exp_val) {
@@ -472,6 +477,8 @@ void VP8LResidualImage(int width, int height, int bits,
   }
 }
 
+#endif
+
 // Inverse prediction.
 static void PredictorInverseTransform(const VP8LTransform* const transform,
                                       int y_start, int y_end, uint32_t* data) {
@@ -524,6 +531,7 @@ static void PredictorInverseTransform(const VP8LTransform* const transform,
   }
 }
 
+#ifdef USE_LOSSLESS_ENCODER
 void VP8LSubtractGreenFromBlueAndRed(uint32_t* argb_data, int num_pixs) {
   int i;
   for (i = 0; i < num_pixs; ++i) {
@@ -534,6 +542,7 @@ void VP8LSubtractGreenFromBlueAndRed(uint32_t* argb_data, int num_pixs) {
     argb_data[i] = (argb & 0xff00ff00) | (new_r << 16) | new_b;
   }
 }
+#endif
 
 // Add green to blue and red channels (i.e. perform the inverse transform of
 // 'subtract green').
@@ -606,6 +615,7 @@ static WEBP_INLINE uint32_t TransformColor(const Multipliers* const m,
   return (argb & 0xff00ff00u) | (new_red << 16) | (new_blue);
 }
 
+#ifdef USE_LOSSLESS_ENCODER
 static WEBP_INLINE int SkipRepeatedPixels(const uint32_t* const argb,
                                           int ix, int xsize) {
   const uint32_t v = argb[ix];
@@ -844,6 +854,7 @@ void VP8LColorSpaceTransform(int width, int height, int bits, int step,
     }
   }
 }
+#endif
 
 // Color space inverse transform.
 static void ColorSpaceInverseTransform(const VP8LTransform* const transform,
diff --git a/src/dsp/lossless.h b/src/dsp/lossless.h
index 7ec5cae4..2ea4e31a 100644
--- a/src/dsp/lossless.h
+++ b/src/dsp/lossless.h
@@ -33,6 +33,7 @@ void VP8LInverseTransform(const struct VP8LTransform* const transform,
                           int row_start, int row_end,
                           uint32_t* const data_in, uint32_t* const data_out);
 
+#ifdef USE_LOSSLESS_ENCODER
 // Subtracts green from blue and red channels.
 void VP8LSubtractGreenFromBlueAndRed(uint32_t* argb_data, int num_pixs);
 
@@ -41,6 +42,8 @@ void VP8LResidualImage(int width, int height, int bits,
 
 void VP8LColorSpaceTransform(int width, int height, int bits, int step,
                              uint32_t* const argb, uint32_t* image);
+#endif
+
 //------------------------------------------------------------------------------
 // Color space conversion.
 
@@ -52,21 +55,23 @@ void VP8LConvertFromBGRA(const uint32_t* const in_data, int num_pixels,
 //------------------------------------------------------------------------------
 // Misc methods.
 
-// Faster logarithm for small integers, with the property of log(0) == 0.
-double VP8LFastLog(int v);
-
 // Computes sampled size of 'size' when sampling using 'sampling bits'.
 static WEBP_INLINE uint32_t VP8LSubSampleSize(uint32_t size,
                                               uint32_t sampling_bits) {
   return (size + (1 << sampling_bits) - 1) >> sampling_bits;
 }
 
+#ifdef USE_LOSSLESS_ENCODER
+// Faster logarithm for small integers, with the property of log(0) == 0.
+double VP8LFastLog(int v);
+
 // In-place difference of each component with mod 256.
 static WEBP_INLINE uint32_t VP8LSubPixels(uint32_t a, uint32_t b) {
   const uint32_t alpha_and_green = (a & 0xff00ff00u) - (b & 0xff00ff00u);
   const uint32_t red_and_blue = (a & 0x00ff00ffu) - (b & 0x00ff00ffu);
   return (alpha_and_green & 0xff00ff00u) | (red_and_blue & 0x00ff00ffu);
 }
+#endif
 
 //------------------------------------------------------------------------------
 
diff --git a/src/enc/backward_references.c b/src/enc/backward_references.c
index 7ed673be..ee233d46 100644
--- a/src/enc/backward_references.c
+++ b/src/enc/backward_references.c
@@ -8,6 +8,8 @@
 // Author: Jyrki Alakuijala (jyrki@google.com)
 //
 
+#ifdef USE_LOSSLESS_ENCODER
+
 #include <assert.h>
 #include <math.h>
 #include <stdint.h>
@@ -785,3 +787,5 @@ Error:
   free(stream);
   return ok;
 }
+
+#endif
diff --git a/src/enc/backward_references.h b/src/enc/backward_references.h
index b8d05e6b..49cca9a7 100644
--- a/src/enc/backward_references.h
+++ b/src/enc/backward_references.h
@@ -11,6 +11,8 @@
 #ifndef WEBP_ENC_BACKWARD_REFERENCES_H_
 #define WEBP_ENC_BACKWARD_REFERENCES_H_
 
+#ifdef USE_LOSSLESS_ENCODER
+
 #include <assert.h>
 #include <stdint.h>
 
@@ -231,4 +233,6 @@ int VP8LCalculateEstimateForPaletteSize(const uint32_t *argb,
 }
 #endif
 
+#endif
+
 #endif  // WEBP_ENC_BACKWARD_REFERENCES_H_
diff --git a/src/enc/config.c b/src/enc/config.c
index 5e1b2540..178d4689 100644
--- a/src/enc/config.c
+++ b/src/enc/config.c
@@ -117,8 +117,13 @@ int WebPValidateConfig(const WebPConfig* const config) {
     return 0;
   if (config->alpha_quality < 0 || config->alpha_quality > 100)
     return 0;
+#ifdef USE_LOSSLESS_ENCODER
   if (config->lossless < 0 || config->lossless > 1)
     return 0;
+#else
+  if (config->lossless != 0)
+    return 0;
+#endif
   return 1;
 }
 
diff --git a/src/enc/histogram.c b/src/enc/histogram.c
index 6ef92942..5c08f97e 100644
--- a/src/enc/histogram.c
+++ b/src/enc/histogram.c
@@ -8,6 +8,7 @@
 // Author: Jyrki Alakuijala (jyrki@google.com)
 //
 
+#ifdef USE_LOSSLESS_ENCODER
 
 #include <math.h>
 #include <stdio.h>
@@ -392,3 +393,5 @@ void VP8LHistogramRefine(VP8LHistogram** raw, int raw_size,
     VP8LHistogramAdd(out[symbols[i]], raw[i]);
   }
 }
+
+#endif
diff --git a/src/enc/histogram.h b/src/enc/histogram.h
index 533f5e83..7ce29f7b 100644
--- a/src/enc/histogram.h
+++ b/src/enc/histogram.h
@@ -12,6 +12,8 @@
 #ifndef WEBP_ENC_HISTOGRAM_H_
 #define WEBP_ENC_HISTOGRAM_H_
 
+#ifdef USE_LOSSLESS_ENCODER
+
 #include <assert.h>
 #include <stddef.h>
 #include <stdlib.h>
@@ -146,4 +148,6 @@ void VP8LHistogramRefine(VP8LHistogram** raw,
 }
 #endif
 
+#endif
+
 #endif  // WEBP_ENC_HISTOGRAM_H_
diff --git a/src/enc/picture.c b/src/enc/picture.c
index 75fc9038..68a3bd6e 100644
--- a/src/enc/picture.c
+++ b/src/enc/picture.c
@@ -105,6 +105,7 @@ int WebPPictureAlloc(WebPPicture* const picture) {
         mem += uv0_size;
       }
     } else {
+#ifdef USE_LOSSLESS_ENCODER
       const uint64_t argb_size = (uint64_t)width * height;
       const uint64_t total_size = argb_size * sizeof(*picture->argb);
       if (width <= 0 || height <= 0 ||
@@ -116,6 +117,9 @@ int WebPPictureAlloc(WebPPicture* const picture) {
       picture->argb = (uint32_t*)malloc(total_size);
       if (picture->argb == NULL) return 0;
       picture->argb_stride = width;
+#else
+      return 0;
+#endif
     }
   }
   return 1;
@@ -129,14 +133,18 @@ static void WebPPictureGrabSpecs(const WebPPicture* const src,
   dst->y = dst->u = dst->v = NULL;
   dst->u0 = dst->v0 = NULL;
   dst->a = NULL;
+#ifdef USE_LOSSLESS_ENCODER
   dst->argb = NULL;
+#endif
 }
 
 // Release memory owned by 'picture'.
 void WebPPictureFree(WebPPicture* const picture) {
   if (picture != NULL) {
     free(picture->y);
+#ifdef USE_LOSSLESS_ENCODER
     free(picture->argb);
+#endif
     WebPPictureGrabSpecs(NULL, picture);
   }
 }
@@ -185,9 +193,13 @@ int WebPPictureCopy(const WebPPicture* const src, WebPPicture* const dst) {
     }
 #endif
   } else {
+#ifdef USE_LOSSLESS_ENCODER
     CopyPlane((uint8_t*)src->argb, 4 * src->argb_stride,
               (uint8_t*)dst->argb, 4 * dst->argb_stride,
               4 * dst->width, dst->height);
+#else
+    return 0;
+#endif
   }
   return 1;
 }
@@ -524,6 +536,7 @@ static int Import(WebPPicture* const picture,
       }
     }
   } else {
+#ifdef USE_LOSSLESS_ENCODER
     if (!import_alpha) {
       for (y = 0; y < height; ++y) {
         for (x = 0; x < width; ++x) {
@@ -551,6 +564,9 @@ static int Import(WebPPicture* const picture,
         }
       }
     }
+#else
+    return 0;
+#endif
   }
   return 1;
 }
diff --git a/src/enc/vp8l.c b/src/enc/vp8l.c
index 0aeb8ea2..f21cc42f 100644
--- a/src/enc/vp8l.c
+++ b/src/enc/vp8l.c
@@ -10,6 +10,8 @@
 // Author: Vikas Arora (vikaas.arora@gmail.com)
 //
 
+#ifdef USE_LOSSLESS_ENCODER
+
 #include <assert.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -535,3 +537,5 @@ int VP8LEncodeImage(const WebPConfig* const config,
 #if defined(__cplusplus) || defined(c_plusplus)
 }    // extern "C"
 #endif
+
+#endif
diff --git a/src/enc/vp8li.h b/src/enc/vp8li.h
index b579dfdf..3a6ab927 100644
--- a/src/enc/vp8li.h
+++ b/src/enc/vp8li.h
@@ -12,6 +12,8 @@
 #ifndef WEBP_ENC_VP8LI_H_
 #define WEBP_ENC_VP8LI_H_
 
+#ifdef USE_LOSSLESS_ENCODER
+
 #include "./histogram.h"
 #include "../webp/encode.h"
 #include "../utils/bit_writer.h"
@@ -70,4 +72,6 @@ int VP8LEncodeImage(const WebPConfig* const config,
 }    // extern "C"
 #endif
 
+#endif
+
 #endif  /* WEBP_ENC_VP8LI_H_ */
diff --git a/src/enc/webpenc.c b/src/enc/webpenc.c
index dc183333..dbe9045e 100644
--- a/src/enc/webpenc.c
+++ b/src/enc/webpenc.c
@@ -364,10 +364,14 @@ int WebPEncode(const WebPConfig* const config, WebPPicture* const pic) {
     }
     DeleteVP8Encoder(enc);
   } else {
+#ifdef USE_LOSSLESS_ENCODER
     if (pic->argb == NULL)
       return WebPEncodingSetError(pic, VP8_ENC_ERROR_NULL_PARAMETER);
 
     ok = VP8LEncodeImage(config, pic);  // Sets pic->error in case of problem.
+#else
+    return WebPEncodingSetError(pic, VP8_ENC_ERROR_INVALID_CONFIGURATION);
+#endif
   }
 
   return ok;
diff --git a/src/utils/bit_writer.c b/src/utils/bit_writer.c
index 04c0db63..bc6e4097 100644
--- a/src/utils/bit_writer.c
+++ b/src/utils/bit_writer.c
@@ -187,6 +187,7 @@ void VP8BitWriterWipeOut(VP8BitWriter* const bw) {
   }
 }
 
+#ifdef USE_LOSSLESS_ENCODER
 //------------------------------------------------------------------------------
 // VP8LBitWriter
 
@@ -264,6 +265,7 @@ void VP8LWriteBits(VP8LBitWriter* const bw, int n_bits, uint32_t bits) {
   }
 }
 
+#endif
 
 //------------------------------------------------------------------------------
 
diff --git a/src/utils/bit_writer.h b/src/utils/bit_writer.h
index f7ca0849..b9cf0b92 100644
--- a/src/utils/bit_writer.h
+++ b/src/utils/bit_writer.h
@@ -64,6 +64,7 @@ static WEBP_INLINE size_t VP8BitWriterSize(const VP8BitWriter* const bw) {
   return bw->pos_;
 }
 
+#ifdef USE_LOSSLESS_ENCODER
 //------------------------------------------------------------------------------
 // VP8LBitWriter
 // TODO(vikasa): VP8LBitWriter is copied as-is from lossless code. There's scope
@@ -115,6 +116,7 @@ void VP8LBitWriterDestroy(VP8LBitWriter* const bw);
 void VP8LWriteBits(VP8LBitWriter* const bw, int n_bits, uint32_t bits);
 
 //------------------------------------------------------------------------------
+#endif
 
 #if defined(__cplusplus) || defined(c_plusplus)
 }    // extern "C"
diff --git a/src/utils/color_cache.h b/src/utils/color_cache.h
index aece1453..bd83f251 100644
--- a/src/utils/color_cache.h
+++ b/src/utils/color_cache.h
@@ -39,6 +39,7 @@ static WEBP_INLINE void VP8LColorCacheInsert(const VP8LColorCache* const cc,
   cc->colors_[key] = argb;
 }
 
+#ifdef USE_LOSSLESS_ENCODER
 static WEBP_INLINE int VP8LColorCacheGetIndex(const VP8LColorCache* const cc,
                                               uint32_t argb) {
   return (kHashMul * argb) >> cc->hash_shift_;
@@ -49,6 +50,7 @@ static WEBP_INLINE int VP8LColorCacheContains(const VP8LColorCache* const cc,
   const uint32_t key = (kHashMul * argb) >> cc->hash_shift_;
   return cc->colors_[key] == argb;
 }
+#endif
 
 //------------------------------------------------------------------------------
 
diff --git a/src/utils/huffman_encode.c b/src/utils/huffman_encode.c
index 405ead37..a5e29168 100644
--- a/src/utils/huffman_encode.c
+++ b/src/utils/huffman_encode.c
@@ -9,6 +9,8 @@
 //
 // Flate like entropy encoding (Huffman) for webp lossless.
 
+#ifdef USE_LOSSLESS_ENCODER
+
 #include "./huffman_encode.h"
 
 #include <stdint.h>
@@ -311,3 +313,5 @@ void ConvertBitDepthsToSymbols(const uint8_t* depth, int len,
     }
   }
 }
+
+#endif
diff --git a/src/utils/huffman_encode.h b/src/utils/huffman_encode.h
index fa484b7a..fe85cbc2 100644
--- a/src/utils/huffman_encode.h
+++ b/src/utils/huffman_encode.h
@@ -12,6 +12,8 @@
 #ifndef WEBP_UTILS_HUFFMAN_ENCODE_H_
 #define WEBP_UTILS_HUFFMAN_ENCODE_H_
 
+#ifdef USE_LOSSLESS_ENCODER
+
 #include <stdint.h>
 
 #if defined(__cplusplus) || defined(c_plusplus)
@@ -49,4 +51,6 @@ void ConvertBitDepthsToSymbols(const uint8_t* depth, int len, uint16_t* bits);
 }
 #endif
 
+#endif
+
 #endif  // WEBP_UTILS_HUFFMAN_ENCODE_H_