diff --git a/.gitmodules b/.gitmodules
index 976f9dabbf184f75600728c281bd2f58b1c41082..584e57a2d6937a3e87d35cf35a2ad87c1e953644 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -16,5 +16,5 @@
 	branch = master
 [submodule "cellframe-sdk-python"]
 	path = cellframe-sdk-python
-	url = ../cellframe-sdk-python
+	url = ../cellframe-sdk-python.git
 	branch = master