diff --git a/lib/Support/Unix/Memory.inc b/lib/Support/Unix/Memory.inc
index 1c6af7fa0f2..58fda420eb6 100644
--- a/lib/Support/Unix/Memory.inc
+++ b/lib/Support/Unix/Memory.inc
@@ -32,8 +32,11 @@
 #  endif
 #endif
 
+#ifdef __APPLE__
 extern "C" void sys_icache_invalidate(const void *Addr, size_t len);
+#else
 extern "C" void __clear_cache(void *, void*);
+#endif
 
 namespace {