diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c
index 35e721a964a0d8897420333d43b5e3ec2f1f5bf6..c8a0caa1949a4c06e86ff9d08220deefa03d5f70 100644
--- a/libavcodec/ac3enc.c
+++ b/libavcodec/ac3enc.c
@@ -1183,7 +1183,7 @@ static inline int asym_quant(int c, int e, int qbits)
 {
     int m;
 
-    c = (((c << e) >> (24 - qbits)) + 1) >> 1;
+    c = (((c * (1<<e)) >> (24 - qbits)) + 1) >> 1;
     m = (1 << (qbits-1));
     if (c >= m)
         c = m - 1;