diff --git a/libavfilter/vf_gradfun.c b/libavfilter/vf_gradfun.c
index 6ae7c60d55..0da9e0b7bb 100644
--- a/libavfilter/vf_gradfun.c
+++ b/libavfilter/vf_gradfun.c
@@ -118,6 +118,7 @@ static void filter(GradFunContext *ctx, uint8_t *dst, const uint8_t *src, int wi
         ctx->filter_line(dst + y * dst_linesize, src + y * src_linesize, dc - r / 2, width, thresh, dither[y & 7]);
         if (++y >= height) break;
     }
+    emms_c();
 }
 
 static av_cold int init(AVFilterContext *ctx)