diff --git a/tools/testing/selftests/timers/valid-adjtimex.c b/tools/testing/selftests/timers/valid-adjtimex.c
index d13ebde20322..2069ed9d5a02 100644
--- a/tools/testing/selftests/timers/valid-adjtimex.c
+++ b/tools/testing/selftests/timers/valid-adjtimex.c
@@ -102,8 +102,12 @@ long outofrange_freq[NUM_FREQ_OUTOFRANGE] = {
 	 1000 * SHIFTED_PPM,
 };
 
+#ifndef LONG_MAX
 #define LONG_MAX (~0UL>>1)
+#endif
+#ifndef LONG_MIN
 #define LONG_MIN (-LONG_MAX - 1)
+#endif
 
 long invalid_freq[NUM_FREQ_INVALID] = {
 	LONG_MAX,