diff --git a/plugins/CuraEngineBackend/CuraEngineBackend.py b/plugins/CuraEngineBackend/CuraEngineBackend.py
index 3b589c28d2..21a3367b7b 100644
--- a/plugins/CuraEngineBackend/CuraEngineBackend.py
+++ b/plugins/CuraEngineBackend/CuraEngineBackend.py
@@ -43,7 +43,7 @@ class CuraEngineBackend(Backend):
         # Find out where the engine is located, and how it is called.
         # This depends on how Cura is packaged and which OS we are running on.
         executable_name = "CuraEngine"
-        default_engine_location = None
+        default_engine_location = ""
         if os.path.exists(os.path.join(Application.getInstallPrefix(), "bin", executable_name)):
             default_engine_location = os.path.join(Application.getInstallPrefix(), "bin", executable_name)
         if hasattr(sys, "frozen"):