diff --git a/tools/testing/selftests/timens/procfs.c b/tools/testing/selftests/timens/procfs.c
index f2519154208a..1833ca97eb24 100644
--- a/tools/testing/selftests/timens/procfs.c
+++ b/tools/testing/selftests/timens/procfs.c
@@ -24,8 +24,6 @@
 #define DAY_IN_SEC			(60*60*24)
 #define TEN_DAYS_IN_SEC			(10*DAY_IN_SEC)
 
-#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
-
 static int child_ns, parent_ns;
 
 static int switch_ns(int fd)
diff --git a/tools/testing/selftests/timens/timens.c b/tools/testing/selftests/timens/timens.c
index 52b6a1185f52..387220791a05 100644
--- a/tools/testing/selftests/timens/timens.c
+++ b/tools/testing/selftests/timens/timens.c
@@ -22,8 +22,6 @@
 #define DAY_IN_SEC			(60*60*24)
 #define TEN_DAYS_IN_SEC			(10*DAY_IN_SEC)
 
-#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
-
 struct test_clock {
 	clockid_t id;
 	char *name;