diff --git a/flakes-tools/scripts/cache-devshells.fish b/flakes-tools/scripts/cache-devshells.fish
index bb768d25..04f1b45c 100644
--- a/flakes-tools/scripts/cache-devshells.fish
+++ b/flakes-tools/scripts/cache-devshells.fish
@@ -6,7 +6,7 @@ set t $( nix flake show --json | jq -r --arg cur_sys "$CURRENT_SYSTEM" '.devShel
 
 if test -n "$t"
     # build devshells
-    printf "%s\n" $t | xargs -I {} nix build .#devShells."$CURRENT_SYSTEM".{}
+    printf "%s\n" $t | xargs -I {} nix build .#devShells."$CURRENT_SYSTEM".{} --print-out-paths | xargs -I {} nix-store --add-root {} --realise
     # save profiles for these devshells
     printf "%s\n" $t | xargs -I {} nix develop .#{} --profile $PROFILES_FOR_DEVSHELLS/{}
     # push profiles for these devshells