diff --git a/libavcodec/diracdec.c b/libavcodec/diracdec.c
index 929832b9ce..a718f00992 100644
--- a/libavcodec/diracdec.c
+++ b/libavcodec/diracdec.c
@@ -285,7 +285,7 @@ static const int qoffset_inter_tab[MAX_QUANT+1] = {
 /* magic number division by 3 from schroedinger */
 static inline int divide3(int x)
 {
-    return ((x+1)*21845 + 10922) >> 16;
+    return (int)((x+1U)*21845 + 10922) >> 16;
 }
 
 static DiracFrame *remove_frame(DiracFrame *framelist[], int picnum)