diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index 8b9bbf38..26de8bb9 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -115,9 +115,21 @@ jobs:
 
     - name: Include MP-Core?
       run: |
+        export HAVE_MP_CORE0=`echo "0"`
+        export HAVE_MP_CORE1=`echo "1"`
+        export HAVE_MP_CORE2=`echo "1%"`
+        echo "HAVE_MP_CORE0=${HAVE_MP_CORE0}"
+        echo "HAVE_MP_CORE1=${HAVE_MP_CORE1}"
+        echo "HAVE_MP_CORE2=${HAVE_MP_CORE2}"
+        export INCLUDE_MP_CORE0=$(echo "$HAVE_MP_CORE0" | grep -o '[01]' | tail -n 1)
+        export INCLUDE_MP_CORE1=$(echo "$HAVE_MP_CORE1" | grep -o '[01]' | tail -n 1)
+        export INCLUDE_MP_CORE2=$(echo "$HAVE_MP_CORE2" | grep -o '[01]' | tail -n 1)
+        echo "INCLUDE_MP_CORE0=${INCLUDE_MP_CORE0}"
+        echo "INCLUDE_MP_CORE1=${INCLUDE_MP_CORE1}"
+        echo "INCLUDE_MP_CORE2=${INCLUDE_MP_CORE2}"
         export HAVE_MP_CORE=`$ML_CMD "fprintf('%d', have_feature('mp_core'))"`
         echo "HAVE_MP_CORE=${HAVE_MP_CORE}"
-        export INCLUDE_MP_CORE=${HAVE_MP_CORE: -1}
+        export INCLUDE_MP_CORE=$(echo "$HAVE_MP_CORE" | grep -o '[01]' | tail -n 1)
         echo "INCLUDE_MP_CORE=${INCLUDE_MP_CORE}"
         echo "INCLUDE_MP_CORE=${INCLUDE_MP_CORE}" >> $GITHUB_ENV