diff --git a/.github/workflows/nix-action-master.yml b/.github/workflows/nix-action-master.yml
index e5a2c3b..12c32e1 100644
--- a/.github/workflows/nix-action-master.yml
+++ b/.github/workflows/nix-action-master.yml
@@ -86,9 +86,9 @@ jobs:
         name: math-comp
     - id: stepCheck
       name: Checking presence of CI target coq-elpi
-      run: "nb_dry_run=$(NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
-        \ bundle \"master\" --argstr job \"coq-elpi\" \\\n   --dry-run 2>&1 > /dev/null)\n\
-        echo $nb_dry_run\necho status=$(echo $nb_dry_run | grep \"built:\" | sed \"\
+      run: "NIXPKGS_ALLOW_UNFREE=1 nix-build --no-out-link \\\n   --argstr\
+        \ bundle \"master\" --argstr job \"coq-elpi\" \\\n   --dry-run 2>&1 > /dev/null\n\
+        echo status=$(echo "build:" | grep \"built:\" | sed \"\
         s/.*/built/\") >> $GITHUB_OUTPUT\n"
     - if: steps.stepCheck.outputs.status == 'built'
       name: 'Building/fetching previous CI target: coq'