diff --git a/src/slic3r/GUI/SelectMachine.cpp b/src/slic3r/GUI/SelectMachine.cpp
index 0b94819020..1602e928d2 100644
--- a/src/slic3r/GUI/SelectMachine.cpp
+++ b/src/slic3r/GUI/SelectMachine.cpp
@@ -2222,7 +2222,7 @@ wxString SelectMachineDialog::format_steel_name(NozzleType type)
         return _L("Tungsten Carbide");
     }
 
-    return _L("Unknown");
+    return wxString::Format(_L("Unknown nozzle type: '%s'"), name);
 }
 
 void SelectMachineDialog::EnableEditing(bool enable)