diff --git a/.github/workflows/build-custom.yml b/.github/workflows/build-custom.yml
index b5629782..7b15f2f8 100644
--- a/.github/workflows/build-custom.yml
+++ b/.github/workflows/build-custom.yml
@@ -168,8 +168,7 @@ jobs:
       run: |
           echo "OpenFOAM command: "
           cat ./openfoam_exec
-          chmod +x ./openfoam_exec
-          ./openfoam_exec ./Allwmake
+          /bin/bash ./openfoam_exec ./Allwmake
     - name: Get tutorials
       run: |
         git clone https://github.com/precice/tutorials.git --branch ${{ github.event.inputs.branchTutorials }} --depth 1
@@ -178,10 +177,10 @@ jobs:
         if ${{ github.event.inputs.runTutorialHeatedPlate }}
         then
           cd tutorials/flow-over-heated-plate/fluid-openfoam
-          ./openfoam_exec ./run.sh | tee fluid-openfoam.log 2>&1 &
+          /bin/bash ./openfoam_exec ./run.sh | tee fluid-openfoam.log 2>&1 &
           PIDfluid=$!
           cd ../solid-openfoam
-          ./openfoam_exec ./run.sh | tee solid-openfoam.log 2>&1
+          /bin/bash ./openfoam_exec ./run.sh | tee solid-openfoam.log 2>&1
           wait $PIDfluid
         fi
     - name: Run tutorial quickstart
@@ -199,7 +198,7 @@ jobs:
             echo "Manually changing from solver to motionSolver in dynamicMeshDict for compatibility with OpenFOAM 9."
             sed -i 's/solver/motionSolver/g' constant/dynamicMeshDict
           fi
-         ./openfoam_exec ./run.sh | tee fluid-openfoam.log 2>&1 &
+         /bin/bash ./openfoam_exec ./run.sh | tee fluid-openfoam.log 2>&1 &
           PIDfluid=$!
           cd ../solid-cpp
           cmake . && make && ./run.sh | tee solid-cpp.log 2>&1
@@ -210,10 +209,10 @@ jobs:
         if ${{ github.event.inputs.runTutorialPartitionedPipe }}
         then
           cd tutorials/partitioned-pipe/fluid1-openfoam-pimplefoam
-         ./openfoam_exec ./run.sh | tee fluid1-openfoam-pimplefoam.log 2>&1 &
+         /bin/bash ./openfoam_exec ./run.sh | tee fluid1-openfoam-pimplefoam.log 2>&1 &
           PIDfluid=$!
           cd ../fluid2-openfoam-pimplefoam
-         ./openfoam_exec ./run.sh | tee fluid2-openfoam-pimplefoam.log 2>&1 &
+         /bin/bash ./openfoam_exec ./run.sh | tee fluid2-openfoam-pimplefoam.log 2>&1 &
           wait $PIDfluid
         fi
     - name: Archive logs