diff --git a/lib/Support/Unix/Process.inc b/lib/Support/Unix/Process.inc
index c6dd3c0dc55..1335b78e86b 100644
--- a/lib/Support/Unix/Process.inc
+++ b/lib/Support/Unix/Process.inc
@@ -69,7 +69,7 @@ static std::pair<TimeValue, TimeValue> getRUsageTimes() {
 }
 
 TimeValue self_process::get_user_time() const {
-#if _POSIX_TIMERS > 0 && defined(_POSIX_CPUTIME)
+#if _POSIX_TIMERS > 0 && _POSIX_CPUTIME > 0
   // Try to get a high resolution CPU timer.
   struct timespec TS;
   if (::clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &TS) == 0)