diff --git a/vpx_ports/mem.h b/vpx_ports/mem.h
index 23e015191..2d49b7a06 100644
--- a/vpx_ports/mem.h
+++ b/vpx_ports/mem.h
@@ -53,10 +53,10 @@
 #define __has_feature(x) 0
 #endif  // !defined(__has_feature)
 
-#if __has_feature(address_sanitizer) || __SANITIZE_ADDRESS__
+#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
 #define VPX_WITH_ASAN 1
 #else
 #define VPX_WITH_ASAN 0
-#endif  // __has_feature(address_sanitizer) || __SANITIZE_ADDRESS
+#endif  // __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
 
 #endif  // VPX_PORTS_MEM_H_