diff --git a/.gitmodules b/.gitmodules
index 0c3b0466088..dcc44626524 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "nix-upstream"]
 	path = nix-upstream
-	url = http://github.com/NixOS/nix.git
+	url = https://github.com/NixOS/nix.git