diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 153c18909ff5..d3c254c0f5c6 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -342,7 +342,7 @@ endif
 
 ifeq ($(DEBUG),0)
   ifeq ($(feature-fortify-source), 1)
-    CORE_CFLAGS += -D_FORTIFY_SOURCE=2
+    CORE_CFLAGS += -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2
   endif
 endif