diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f3814e4..66aa518 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -126,6 +126,7 @@ jobs:
           echo "MESON_OPTIONS=-Dbuild_serial_interface=true" >> ${GITHUB_ENV}
           echo "MESON_FALLBACK_OPTIONS=-Dfortuno:build_serial_interface=true" >> ${GITHUB_ENV}
           echo "INTERFACE=serial" >> ${GITHUB_ENV}
+          echo "RUN_PREFIX=" >> ${GITHUB_ENV}
 
       - name: Setup mpi interface options
         if: ${{ contains(matrix.interface, 'mpi') }}
@@ -134,6 +135,7 @@ jobs:
           echo "MESON_OPTIONS=-Dbuild_mpi_interface=true" >> ${GITHUB_ENV}
           echo "MESON_FALLBACK_OPTIONS=-Dfortuno:build_mpi_interface=true" >> ${GITHUB_ENV}
           echo "INTERFACE=mpi" >> ${GITHUB_ENV}
+          echo "RUN_PREFIX=mpirun -n 2"
 
       - name: Setup build tools
         run: |
@@ -150,8 +152,8 @@ jobs:
         run: |
           CMAKE_PREFIX_PATH=${INSTALL_DIR} cmake -B ${BUILD_DIR} -G Ninja test/export/${INTERFACE}
           cmake --build ${BUILD_DIR}
-          ${BUILD_DIR}/app/testapp
-          ${BUILD_DIR}/app/testapp_fypp
+          ${RUN_PREFIX} ${BUILD_DIR}/app/testapp
+          ${RUN_PREFIX} ${BUILD_DIR}/app/testapp_fypp
           rm -rf ${BUILD_DIR}
 
       - name: Test fpm export
@@ -168,7 +170,7 @@ jobs:
           cd test/export/${INTERFACE}
           meson setup --wrap-mode nofallback ${BUILD_DIR}
           ninja -C ${BUILD_DIR}
-          ${BUILD_DIR}/testapp
+          ${RUN_PREFIX} ${BUILD_DIR}/testapp
           rm -rf ./${BUILD_DIR}
 
       - name: Test Meson subproject export
@@ -183,5 +185,5 @@ jobs:
           echo -e "url=file://${FORTUNO_DIR}\nrevision=${GIT_REV}\n" >> subprojects/fortuno.wrap
           meson setup ${MESON_FALLBACK_OPTIONS} --wrap-mode forcefallback ${BUILD_DIR}
           ninja -C ${BUILD_DIR}
-          ${BUILD_DIR}/testapp
+          ${RUN_PREFIX} ${BUILD_DIR}/testapp
           rm -rf subprojects ${BUILD_DIR}