diff --git a/libavcodec/hq_hqadsp.c b/libavcodec/hq_hqadsp.c
index db1ea2e246..1b9f138c72 100644
--- a/libavcodec/hq_hqadsp.c
+++ b/libavcodec/hq_hqadsp.c
@@ -30,7 +30,7 @@
 #define FIX_1_414 23170
 #define FIX_2_613 21407 // divided by two to fit the range
 
-#define IDCTMUL(a, b) ((a) * (b) >> 16)
+#define IDCTMUL(a, b) ((int)((a) * (unsigned)(b)) >> 16)
 
 static inline void idct_row(int16_t *blk)
 {