diff --git a/testing/ostest/rmutex.c b/testing/ostest/rmutex.c
index d1b94466b..5ae872c94 100644
--- a/testing/ostest/rmutex.c
+++ b/testing/ostest/rmutex.c
@@ -207,4 +207,5 @@ void recursive_mutex_test(void)
     }
 
   printf("recursive_mutex_test: Complete\n");
+  pthread_mutex_destroy(&mut);
 }