diff --git a/test/class/opal_fifo.c b/test/class/opal_fifo.c
index 122524a..ca9cb7e 100644
--- a/test/class/opal_fifo.c
+++ b/test/class/opal_fifo.c
@@ -63,7 +63,7 @@ static void *thread_test (void *arg) {
     printf ("Atomics thread finished. Time: %d s %d us %d nsec/poppush\n", (int) total.tv_sec,
             (int)total.tv_usec, (int)(timing / 1e-9));
 
-    return NULL;
+    pthread_exit(NULL);
 }
 
 static void *thread_test_exhaust (void *arg) {