diff --git a/binaries/data/mods/public/simulation/components/tests/setup.js b/binaries/data/mods/public/simulation/components/tests/setup.js
index 7654848a53..99009b4150 100644
--- a/binaries/data/mods/public/simulation/components/tests/setup.js
+++ b/binaries/data/mods/public/simulation/components/tests/setup.js
@@ -1,4 +1,5 @@
 var g_NewIID = 1000; // some arbitrary not-yet-used number
+var g_NewMTID = 1000; // some arbitrary not-yet-used number
 var g_ComponentTypes = {};
 var g_Components = {};
 
@@ -15,6 +16,11 @@ Engine.RegisterInterface = function(name)
 	global["IID_"+name] = g_NewIID++;
 };
 
+Engine.RegisterMessageType = function(name)
+{
+	global["MT_"+name] = g_NewMTID++;
+};
+
 Engine.QueryInterface = function(ent, iid)
 {
 	if (g_Components[ent] && g_Components[ent][iid])