diff --git a/.gitmodules b/.gitmodules
index eac0686..e8e94b7 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,4 +4,4 @@
 
 [submodule "theme"]
 	path = themes/hugo-book
-	url = https://github.com/alex-shpak/hugo-book
+	url = https://github.com/alex-shpak/hugo-book.git