diff --git a/src/dsp/yuv_mips32.c b/src/dsp/yuv_mips32.c
index 4746ff33..80b9ba3c 100644
--- a/src/dsp/yuv_mips32.c
+++ b/src/dsp/yuv_mips32.c
@@ -84,17 +84,21 @@ ROW_FUNC(YuvToBgraRow,     4, 2, 1, 0, 3)
 
 #undef ROW_FUNC
 
-#endif   // WEBP_USE_MIPS32
-
 //------------------------------------------------------------------------------
+// Entry point
 
 extern void WebPInitSamplersMIPS32(void);
 
 WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplersMIPS32(void) {
-#if defined(WEBP_USE_MIPS32)
   WebPSamplers[MODE_RGB]  = YuvToRgbRow;
   WebPSamplers[MODE_RGBA] = YuvToRgbaRow;
   WebPSamplers[MODE_BGR]  = YuvToBgrRow;
   WebPSamplers[MODE_BGRA] = YuvToBgraRow;
-#endif  // WEBP_USE_MIPS32
 }
+
+#else  // !WEBP_USE_MIPS32
+
+extern void WebPInitSamplersMIPS32(void);
+WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplersMIPS32(void) {}
+
+#endif  // WEBP_USE_MIPS32
diff --git a/src/dsp/yuv_mips_dsp_r2.c b/src/dsp/yuv_mips_dsp_r2.c
index 9cfa50b4..8f6caa93 100644
--- a/src/dsp/yuv_mips_dsp_r2.c
+++ b/src/dsp/yuv_mips_dsp_r2.c
@@ -115,17 +115,21 @@ ROW_FUNC(YuvToBgraRow,     4, 2, 1, 0, 3)
 #undef ROW_FUNC_PART_2
 #undef ROW_FUNC_PART_1
 
-#endif  // WEBP_USE_MIPS_DSP_R2
-
 //------------------------------------------------------------------------------
+// Entry point
 
 extern void WebPInitSamplersMIPSdspR2(void);
 
 WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplersMIPSdspR2(void) {
-#if defined(WEBP_USE_MIPS_DSP_R2)
   WebPSamplers[MODE_RGB]  = YuvToRgbRow;
   WebPSamplers[MODE_RGBA] = YuvToRgbaRow;
   WebPSamplers[MODE_BGR]  = YuvToBgrRow;
   WebPSamplers[MODE_BGRA] = YuvToBgraRow;
-#endif  // WEBP_USE_MIPS_DSP_R2
 }
+
+#else  // !WEBP_USE_MIPS_DSP_R2
+
+extern void WebPInitSamplersMIPSdspR2(void);
+WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplersMIPSdspR2(void) {}
+
+#endif  // WEBP_USE_MIPS_DSP_R2
diff --git a/src/dsp/yuv_sse2.c b/src/dsp/yuv_sse2.c
index 08cebd07..d7671ce3 100644
--- a/src/dsp/yuv_sse2.c
+++ b/src/dsp/yuv_sse2.c
@@ -304,19 +304,22 @@ static void YuvToBgrRowSSE2(const uint8_t* y,
   }
 }
 
-#endif  // WEBP_USE_SSE2
-
 //------------------------------------------------------------------------------
 // Entry point
 
 extern void WebPInitSamplersSSE2(void);
 
 WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplersSSE2(void) {
-#if defined(WEBP_USE_SSE2)
   WebPSamplers[MODE_RGB]  = YuvToRgbRowSSE2;
   WebPSamplers[MODE_RGBA] = YuvToRgbaRowSSE2;
   WebPSamplers[MODE_BGR]  = YuvToBgrRowSSE2;
   WebPSamplers[MODE_BGRA] = YuvToBgraRowSSE2;
   WebPSamplers[MODE_ARGB] = YuvToArgbRowSSE2;
-#endif  // WEBP_USE_SSE2
 }
+
+#else  // !WEBP_USE_SSE2
+
+extern void WebPInitSamplersSSE2(void);
+WEBP_TSAN_IGNORE_FUNCTION void WebPInitSamplersSSE2(void) {}
+
+#endif  // WEBP_USE_SSE2