diff --git a/.github/workflows/build_linux.yml b/.github/workflows/build_linux.yml
index 25ed778..86876ce 100644
--- a/.github/workflows/build_linux.yml
+++ b/.github/workflows/build_linux.yml
@@ -24,9 +24,9 @@ jobs:
         id: set_compiler
         run: |
           if [ "${{ matrix.compiler }}" == "gcc-13" ]; then
-            echo "{cxx_compiler}={g++-13}" >> $GITHUB_OUTPUT
+            echo "cxx_compiler=g++-13" >> $GITHUB_OUTPUT
           elif [ "${{ matrix.compiler }}" == "clang-18" ]; then
-            echo "{cxx_compiler}={clang++-18}" >> $GITHUB_OUTPUT
+            echo "cxx_compiler=clang++-18" >> $GITHUB_OUTPUT
           fi
 
       - name: 'Configure psyc ${{ matrix.compiler }}_${{ matrix.build_config }}'