diff --git a/cura/BackendPlugin.py b/cura/BackendPlugin.py
index de7b3f29dc..fe8f2246e4 100644
--- a/cura/BackendPlugin.py
+++ b/cura/BackendPlugin.py
@@ -41,7 +41,7 @@ class BackendPlugin(PluginObject):
         if not self._plugin_command or "--port" in self._plugin_command:
             return self._plugin_command or []
 
-        return self._plugin_command + ["--port", str(self.__port)]
+        return self._plugin_command + ["--port=", str(self.__port)]
 
     def start(self) -> bool:
         """