diff --git a/.gitmodules b/.gitmodules
index d063a8e8..4d698f93 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "tools/clang"]
 	path = tools/clang
-	url = ../../wjakob/clang-cindex-python3
+	url = ../../wjakob/clang-cindex-python3.git