diff --git a/maintenance/tools/builder/lib.sh b/maintenance/tools/builder/lib.sh
index 0aecb7649..33e5ad79c 100755
--- a/maintenance/tools/builder/lib.sh
+++ b/maintenance/tools/builder/lib.sh
@@ -65,7 +65,7 @@ function prepare() {
   # Creates list of what to build when only building what changed
   if [ -n "${NYX_CHANGED_ONLY:-}" ]; then
     _DIFF=$(nix build --no-link --print-out-paths --impure \
-      --expr "(builtins.getFlake \"$NYX_SOURCE\").devShells.${NYX_TARGET}.comparer.passthru.any \"$NYX_CHANGED_ONLY\"" \
+      --expr "(builtins.getFlake \"$NYX_SOURCE/maintenance\").devShells.${NYX_TARGET}.comparer.passthru.any \"$NYX_CHANGED_ONLY\"" \
       || exit 13)
 
     ln -s "$_DIFF" filter.txt