diff --git a/libavformat/grab.c b/libavformat/grab.c
index 56d16a950d..1abfbd60a4 100644
--- a/libavformat/grab.c
+++ b/libavformat/grab.c
@@ -839,9 +839,7 @@ static int aiw_read_picture(VideoData *s, uint8_t *data)
                 DEINT_LINE_LUM(12)
                 }
     }
-#ifdef HAVE_MMX
-    emms();
-#endif
+    emms_c();
     return s->frame_size;
 }