diff --git a/src/t_zset.c b/src/t_zset.c
index 1c509db81b..41483c8b71 100644
--- a/src/t_zset.c
+++ b/src/t_zset.c
@@ -1515,6 +1515,7 @@ void zunionInterGenericCommand(redisClient *c, robj *dstkey, int op) {
 
     dstobj = createZsetObject();
     dstzset = dstobj->ptr;
+    memset(&zval,0,sizeof(zval));
 
     if (op == REDIS_OP_INTER) {
         /* Skip everything if the smallest input is empty. */