diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc b/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
index 1d58205e7861..ca571d1a9fd5 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
@@ -72,9 +72,11 @@
 
 // Platform-specific options.
 #if SANITIZER_MAC
+namespace __sanitizer {
 bool PlatformHasDifferentMemcpyAndMemmove();
+}
 #define PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE \
-  (PlatformHasDifferentMemcpyAndMemmove())
+  (__sanitizer::PlatformHasDifferentMemcpyAndMemmove())
 #elif SANITIZER_WINDOWS64
 #define PLATFORM_HAS_DIFFERENT_MEMCPY_AND_MEMMOVE false
 #else