diff --git a/async.c b/async.c
index 48c40c3..f3b57e3 100644
--- a/async.c
+++ b/async.c
@@ -391,7 +391,7 @@ static int __redisGetSubscribeCallback(redisAsyncContext *ac, redisReply *reply,
 
 void redisProcessCallbacks(redisAsyncContext *ac) {
     redisContext *c = &(ac->c);
-    redisCallback cb;
+    redisCallback cb = {NULL, NULL, NULL};
     void *reply = NULL;
     int status;