diff --git a/libswscale/swscale_template.c b/libswscale/swscale_template.c
index 0aa60357e0..76297d6e59 100644
--- a/libswscale/swscale_template.c
+++ b/libswscale/swscale_template.c
@@ -2577,7 +2577,7 @@ static int RENAME(swScale)(SwsContext *c, const uint8_t* src[], int srcStride[],
     int16_t *hChrFilter= c->hChrFilter;
     int32_t *lumMmxFilter= c->lumMmxFilter;
     int32_t *chrMmxFilter= c->chrMmxFilter;
-    int32_t *alpMmxFilter= c->alpMmxFilter;
+    int32_t av_unused *alpMmxFilter= c->alpMmxFilter;
     const int vLumFilterSize= c->vLumFilterSize;
     const int vChrFilterSize= c->vChrFilterSize;
     const int hLumFilterSize= c->hLumFilterSize;