diff --git a/lua/entities/gmod_wire_materializer.lua b/lua/entities/gmod_wire_materializer.lua
index e71b93eca2..814a627a57 100644
--- a/lua/entities/gmod_wire_materializer.lua
+++ b/lua/entities/gmod_wire_materializer.lua
@@ -47,7 +47,7 @@ function ENT:TriggerInput(iname, value)
 end
 
 function ENT:ShowOutput(value)
-	self:SetOverlayText("Material: " .. value)
+	self:SetOverlayText("Material: " .. tostring(value))
 end
 
 duplicator.RegisterEntityClass("gmod_wire_materializer", WireLib.MakeWireEnt, "Data", "Material", "Range")