diff --git a/compiler-rt/test/tsan/libdispatch/dispatch_once_deadlock.c b/compiler-rt/test/tsan/libdispatch/dispatch_once_deadlock.c
index 1e9e7d139f4c..8379f81a9101 100644
--- a/compiler-rt/test/tsan/libdispatch/dispatch_once_deadlock.c
+++ b/compiler-rt/test/tsan/libdispatch/dispatch_once_deadlock.c
@@ -28,8 +28,8 @@ int main() {
 
   f();
 
-  pthread_mutex_t mutex = {0};
-  pthread_mutex_lock(&mutex);
+  pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+  pthread_mutex_unlock(&mutex); // Unlock of an unlocked mutex
 
   fprintf(stderr, "g = %ld.\n", g);
   fprintf(stderr, "h = %ld.\n", h);