diff --git a/libavcodec/wavpack.h b/libavcodec/wavpack.h
index 445d593c3b..c949390f51 100644
--- a/libavcodec/wavpack.h
+++ b/libavcodec/wavpack.h
@@ -171,7 +171,7 @@ static av_always_inline int wp_exp2(int16_t val)
 
     res   = wp_exp2_table[val & 0xFF] | 0x100;
     val >>= 8;
-    if (val > 31)
+    if (val > 31U)
         return INT_MIN;
     res   = (val > 9) ? (res << (val - 9)) : (res >> (9 - val));
     return neg ? -res : res;