diff --git a/src/dsp/lossless.h b/src/dsp/lossless.h
index e4da705f..8c7551c9 100644
--- a/src/dsp/lossless.h
+++ b/src/dsp/lossless.h
@@ -56,24 +56,20 @@ extern VP8LConvertFunc VP8LConvertBGRAToRGB565;
 extern VP8LConvertFunc VP8LConvertBGRAToBGR;
 
 // Expose some C-only fallback functions
-extern void VP8LTransformColor_C(const VP8LMultipliers* const m,
+void VP8LTransformColor_C(const VP8LMultipliers* const m,
+                          uint32_t* data, int num_pixels);
+void VP8LTransformColorInverse_C(const VP8LMultipliers* const m,
                                  uint32_t* data, int num_pixels);
-extern void VP8LTransformColorInverse_C(const VP8LMultipliers* const m,
-                                        uint32_t* data, int num_pixels);
 
-extern void VP8LConvertBGRAToRGB_C(const uint32_t* src,
-                                   int num_pixels, uint8_t* dst);
-extern void VP8LConvertBGRAToRGBA_C(const uint32_t* src,
-                                    int num_pixels, uint8_t* dst);
-extern void VP8LConvertBGRAToRGBA4444_C(const uint32_t* src,
-                                        int num_pixels, uint8_t* dst);
-extern void VP8LConvertBGRAToRGB565_C(const uint32_t* src,
-                                      int num_pixels, uint8_t* dst);
-extern void VP8LConvertBGRAToBGR_C(const uint32_t* src,
-                                   int num_pixels, uint8_t* dst);
-extern void VP8LSubtractGreenFromBlueAndRed_C(uint32_t* argb_data,
-                                              int num_pixels);
-extern void VP8LAddGreenToBlueAndRed_C(uint32_t* data, int num_pixels);
+void VP8LConvertBGRAToRGB_C(const uint32_t* src, int num_pixels, uint8_t* dst);
+void VP8LConvertBGRAToRGBA_C(const uint32_t* src, int num_pixels, uint8_t* dst);
+void VP8LConvertBGRAToRGBA4444_C(const uint32_t* src,
+                                 int num_pixels, uint8_t* dst);
+void VP8LConvertBGRAToRGB565_C(const uint32_t* src,
+                               int num_pixels, uint8_t* dst);
+void VP8LConvertBGRAToBGR_C(const uint32_t* src, int num_pixels, uint8_t* dst);
+void VP8LSubtractGreenFromBlueAndRed_C(uint32_t* argb_data, int num_pixels);
+void VP8LAddGreenToBlueAndRed_C(uint32_t* data, int num_pixels);
 
 // Must be called before calling any of the above methods.
 void VP8LDspInit(void);
diff --git a/src/enc/cost.h b/src/enc/cost.h
index 5d107569..4e558952 100644
--- a/src/enc/cost.h
+++ b/src/enc/cost.h
@@ -42,7 +42,7 @@ typedef void (*VP8SetResidualCoeffsFunc)(const int16_t* const coeffs,
                                          VP8Residual* const res);
 extern VP8SetResidualCoeffsFunc VP8SetResidualCoeffs;
 
-extern void VP8SetResidualCoeffsInit(void);  // must be called first
+void VP8SetResidualCoeffsInit(void);  // must be called first
 
 int VP8RecordCoeffs(int ctx, const VP8Residual* const res);
 
@@ -59,7 +59,7 @@ static WEBP_INLINE int VP8BitCost(int bit, uint8_t proba) {
 typedef int (*VP8GetResidualCostFunc)(int ctx0, const VP8Residual* const res);
 extern VP8GetResidualCostFunc VP8GetResidualCost;
 
-extern void VP8GetResidualCostInit(void);  // must be called first
+void VP8GetResidualCostInit(void);  // must be called first
 
 // Level cost calculations
 extern const uint16_t VP8LevelCodes[MAX_VARIABLE_LEVEL][2];