diff --git a/scripts/lib/nix.fish b/scripts/lib/nix.fish
index 76f1fc99..670c8f89 100644
--- a/scripts/lib/nix.fish
+++ b/scripts/lib/nix.fish
@@ -11,8 +11,12 @@ begin
         source "$config"
 
         if ! __isNixModule "$nixPkgsCache"
-            mkdir -p "$nixPkgsCache"
-            and git clone https://github.com/NixOS/nixpkgs.git --depth=1 -b "$nixPkgsVersion" "$nixPkgsCache"
+            rm -rf "$nixPkgsCache"
+            and mkdir -p "$nixPkgsCache"
+            and git -C "$nixPkgsCache" init
+            and git -C "$nixPkgsCache" remote add origin https://github.com/NixOS/nixpkgs.git
+            and git -C "$nixPkgsCache" fetch --depth=1 origin "$nixPkgsVersion"
+            and git -C "$nixPkgsCache" reset --hard FETCH_HEAD
             and rm -rf "$nixPkgsCache/.git"
         end
     end