diff --git a/.gitmodules b/.gitmodules
index 4f602e48fd4..da4e5bdad10 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,6 +1,6 @@
 [submodule "RobustToolbox"]
 	path = RobustToolbox
-	url = https://github.com/space-wizards/RobustToolbox
+	url = https://github.com/space-wizards/RobustToolbox.git
 	branch = master
 [submodule "Secrets"]
 	path = Secrets