diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 642a3ce..92faaea 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -34,6 +34,8 @@ jobs:
         cd "$RUNNER_TEMP"
         git clone https://github.com/szpajder/libacars.git
         cd libacars
+        if [[ "${{ github.ref_name }}" == "master" ]]; then branch=master; else branch=unstable; fi
+        echo "libacars branch used: "$branch"
         mkdir build
         cd build
         cmake ..