diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_placement_new.h b/compiler-rt/lib/sanitizer_common/sanitizer_placement_new.h
index 292e167863b1a786cc3c448dc5b3ca0a69d88a9d..4dd71aeaf4bf37cf59f8a48e813e0a430b4fe728 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_placement_new.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_placement_new.h
@@ -18,14 +18,16 @@
 
 #include "sanitizer_internal_defs.h"
 
-#if __WORDSIZE == 64
-inline void *operator new(__sanitizer::uptr sz, void *p) {
-  return p;
-}
+namespace __sanitizer {
+#if (__WORDSIZE == 64) || defined(__APPLE__)
+typedef __sanitizer::uptr operator_new_ptr_type;
 #else
-inline void *operator new(__sanitizer::u32 sz, void *p) {
+typedef __sanitizer::u32 operator_new_ptr_type;
+#endif
+}  // namespace __sanitizer
+
+inline void *operator new(operator_new_ptr_type sz, void *p) {
   return p;
 }
-#endif
 
 #endif  // SANITIZER_PLACEMENT_NEW_H