diff --git a/libavcodec/aacdec_fixed.c b/libavcodec/aacdec_fixed.c
index 35425bd468..411d96d5a6 100644
--- a/libavcodec/aacdec_fixed.c
+++ b/libavcodec/aacdec_fixed.c
@@ -221,10 +221,15 @@ static void noise_scale(int *coefs, int scale, int band_energy, int len)
     }
     else {
         s = s + 32;
-        round = s ? 1 << (s-1) : 0;
-        for (i=0; i<len; i++) {
-            out = (int)((int64_t)((int64_t)coefs[i] * c + round) >> s);
-            coefs[i] = -out;
+        if (s > 0) {
+            round = 1 << (s-1);
+            for (i=0; i<len; i++) {
+                out = (int)((int64_t)((int64_t)coefs[i] * c + round) >> s);
+                coefs[i] = -out;
+            }
+        } else {
+            for (i=0; i<len; i++)
+                coefs[i] = -(int64_t)coefs[i] * c * (1 << -s);
         }
     }
 }