diff --git a/Sources/CoreFoundation/include/CFUnicodeDecomposition.h b/Sources/CoreFoundation/include/CFUnicodeDecomposition.h
index 0bded1f6c0..c9ea67cfb3 100644
--- a/Sources/CoreFoundation/include/CFUnicodeDecomposition.h
+++ b/Sources/CoreFoundation/include/CFUnicodeDecomposition.h
@@ -18,7 +18,7 @@
 CF_EXTERN_C_BEGIN
 
 CF_INLINE bool CFUniCharIsDecomposableCharacter(UTF32Char character, bool isHFSPlusCanonical) {
-    if (isHFSPlusCanonical && !isHFSPlusCanonical) return false;    // hack to get rid of "unused" warning
+    (void)isHFSPlusCanonical;
     if (character < 0x80) return false;
     return CFUniCharIsMemberOf(character, kCFUniCharHFSPlusDecomposableCharacterSet);
 }