diff --git a/libFDK/include/scale.h b/libFDK/include/scale.h
index 07bd3af..30fa089 100644
--- a/libFDK/include/scale.h
+++ b/libFDK/include/scale.h
@@ -268,11 +268,11 @@
  * to avoid problems when inverting the sign of the result.
  */
 #ifndef SATURATE_LEFT_SHIFT_ALT
-#define SATURATE_LEFT_SHIFT_ALT(src, scale, dBits)                       \
-  (((LONG)(src) > ((LONG)(((1U) << ((dBits)-1)) - 1) >> (scale)))        \
-       ? (LONG)(((1U) << ((dBits)-1)) - 1)                               \
-       : ((LONG)(src) < ~((LONG)(((1U) << ((dBits)-1)) - 2) >> (scale))) \
-             ? ~((LONG)(((1U) << ((dBits)-1)) - 2))                      \
+#define SATURATE_LEFT_SHIFT_ALT(src, scale, dBits)                        \
+  (((LONG)(src) > ((LONG)(((1U) << ((dBits)-1)) - 1) >> (scale)))         \
+       ? (LONG)(((1U) << ((dBits)-1)) - 1)                                \
+       : ((LONG)(src) <= ~((LONG)(((1U) << ((dBits)-1)) - 1) >> (scale))) \
+             ? ~((LONG)(((1U) << ((dBits)-1)) - 2))                       \
              : ((LONG)(src) << (scale)))
 #endif