diff --git a/src/object.cpp b/src/object.cpp
index 3befa73d7..2c763d0b4 100644
--- a/src/object.cpp
+++ b/src/object.cpp
@@ -1373,7 +1373,7 @@ NULL
             }
         }
         if ((de = dictFind(c->db->pdict,ptrFromObj(c->argv[2]))) == NULL) {
-            addReplyNull(c, shared.nullbulk);
+            addReplyNull(c);
             return;
         }
         size_t usage = objectComputeSize((robj*)dictGetVal(de),samples);
diff --git a/src/pubsub.cpp b/src/pubsub.cpp
index 07e0e85f6..3ccbb6a66 100644
--- a/src/pubsub.cpp
+++ b/src/pubsub.cpp
@@ -89,7 +89,7 @@ void addReplyPubsubUnsubscribed(client *c, robj *channel) {
     if (channel)
         addReplyBulk(c,channel);
     else
-        addReplyNull(c, shared.nullbulk);
+        addReplyNull(c);
     addReplyLongLong(c,clientSubscriptionsCount(c));
 }
 
@@ -117,7 +117,7 @@ void addReplyPubsubPatUnsubscribed(client *c, robj *pattern) {
     if (pattern)
         addReplyBulk(c,pattern);
     else
-        addReplyNull(c, shared.nullbulk);
+        addReplyNull(c);
     addReplyLongLong(c,clientSubscriptionsCount(c));
 }