diff --git a/.gitmodules b/.gitmodules
index 6f684e1..8886395 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "src/protocol"]
 	path = src/protocol
-	url = https://git.sys36.net/windows-96/ppp2/protocol
+	url = git@git.sys36.net:windows-96/ppp2/protocol.git