diff --git a/common/x86/mc-c.c b/common/x86/mc-c.c
index 1af512b..ca4a127 100644
--- a/common/x86/mc-c.c
+++ b/common/x86/mc-c.c
@@ -310,14 +310,17 @@ void x264_mc_init_mmx( int cpu, x264_mc_functions_t *pf )
     if( !(cpu&X264_CPU_SSSE3) )
         return;
 
-    pf->avg[PIXEL_16x16] = x264_pixel_avg_16x16_ssse3;
-    pf->avg[PIXEL_16x8]  = x264_pixel_avg_16x8_ssse3;
-    pf->avg[PIXEL_8x16]  = x264_pixel_avg_8x16_ssse3;
-    pf->avg[PIXEL_8x8]   = x264_pixel_avg_8x8_ssse3;
-    pf->avg[PIXEL_8x4]   = x264_pixel_avg_8x4_ssse3;
-    pf->avg[PIXEL_4x8]   = x264_pixel_avg_4x8_ssse3;
-    pf->avg[PIXEL_4x4]   = x264_pixel_avg_4x4_ssse3;
-    pf->avg[PIXEL_4x2]   = x264_pixel_avg_4x2_ssse3;
+    if (!(cpu&X264_CPU_STACK_MOD4))
+    {
+        pf->avg[PIXEL_16x16] = x264_pixel_avg_16x16_ssse3;
+        pf->avg[PIXEL_16x8]  = x264_pixel_avg_16x8_ssse3;
+        pf->avg[PIXEL_8x16]  = x264_pixel_avg_8x16_ssse3;
+        pf->avg[PIXEL_8x8]   = x264_pixel_avg_8x8_ssse3;
+        pf->avg[PIXEL_8x4]   = x264_pixel_avg_8x4_ssse3;
+        pf->avg[PIXEL_4x8]   = x264_pixel_avg_4x8_ssse3;
+        pf->avg[PIXEL_4x4]   = x264_pixel_avg_4x4_ssse3;
+        pf->avg[PIXEL_4x2]   = x264_pixel_avg_4x2_ssse3;
+    }
 
     pf->hpel_filter = x264_hpel_filter_ssse3;
     pf->frame_init_lowres_core = x264_frame_init_lowres_core_ssse3;