diff --git a/src/server/game/Texts/CreatureTextMgr.h b/src/server/game/Texts/CreatureTextMgr.h
index f2f7a229e50..2c0044bd709 100644
--- a/src/server/game/Texts/CreatureTextMgr.h
+++ b/src/server/game/Texts/CreatureTextMgr.h
@@ -144,7 +144,7 @@ class CreatureTextLocalizer
             {
                 messageTemplate = new WorldPacket();
                 whisperGUIDpos = _builder(messageTemplate, loc_idx);
-                ASSERT(messageTemplate->GetOpcode() != MSG_NULL_ACTION);
+                ASSERT(messageTemplate->GetOpcode() != NULL_OPCODE);
                 _packetCache[loc_idx] = new std::pair<WorldPacket*, size_t>(messageTemplate, whisperGUIDpos);
             }
             else