diff --git a/libavcodec/aacdec_fixed.c b/libavcodec/aacdec_fixed.c
index 167f5b68a1..1bdb93f5bc 100644
--- a/libavcodec/aacdec_fixed.c
+++ b/libavcodec/aacdec_fixed.c
@@ -436,7 +436,7 @@ static void apply_independent_coupling_fixed(AACContext *ac,
     else {
       for (i = 0; i < len; i++) {
           tmp = (int)(((int64_t)src[i] * c + (int64_t)0x1000000000) >> 37);
-          dest[i] += tmp * (1 << shift);
+          dest[i] += tmp * (1U << shift);
       }
     }
 }