diff --git a/source/core/gamecontrol.cpp b/source/core/gamecontrol.cpp
index 0c09e0acb..b1e399646 100644
--- a/source/core/gamecontrol.cpp
+++ b/source/core/gamecontrol.cpp
@@ -382,6 +382,7 @@ void UserConfig::ProcessOptions()
 			gamegrp = v;
 		}
 	}
+	FixPathSeperator(gamegrp);
 
 	Args->CollectFiles("-rts", ".rts");
 	auto rts = Args->CheckValue("-rts");