diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 9ae7e6e35f9a..978572dfeb14 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -1,7 +1,6 @@
 #ifndef GIT_COMPAT_UTIL_H
 #define GIT_COMPAT_UTIL_H
 
-#define _ALL_SOURCE 1
 #define _BSD_SOURCE 1
 /* glibc 2.20 deprecates _BSD_SOURCE in favour of _DEFAULT_SOURCE */
 #define _DEFAULT_SOURCE 1