diff --git a/libavutil/x86/intmath.h b/libavutil/x86/intmath.h
index f3acddc0e3..4b386432c2 100644
--- a/libavutil/x86/intmath.h
+++ b/libavutil/x86/intmath.h
@@ -27,7 +27,7 @@
         __asm__ volatile(\
             "mull %3"\
             :"=d"(ret), "=a"(dmy)\
-            :"1"(a), "g"(ff_inverse[b])\
+            :"1"((unsigned int)(a)), "g"(ff_inverse[b])\
             );\
         ret;\
     })