diff --git a/libavcodec/dct-test.c b/libavcodec/dct-test.c
index c3ef297c49..dd8099b2e2 100644
--- a/libavcodec/dct-test.c
+++ b/libavcodec/dct-test.c
@@ -531,6 +531,7 @@ int main(int argc, char **argv)
 
     init_fdct();
     idct_mmx_init();
+    mm_flags = mm_support();
 
     for(i=0;i<256;i++) cropTbl[i + MAX_NEG_CROP] = i;
     for(i=0;i<MAX_NEG_CROP;i++) {