diff --git a/.github/workflows/c-zephyr-tests.yml b/.github/workflows/c-zephyr-tests.yml
index 443dd347af..2a69452506 100644
--- a/.github/workflows/c-zephyr-tests.yml
+++ b/.github/workflows/c-zephyr-tests.yml
@@ -45,21 +45,21 @@ jobs:
             --tests org.lflang.tests.runtime.CZephyrTest.buildZephyrUnthreaded* \
             --tests org.lflang.tests.runtime.CZephyrTest.buildZephyrThreaded* core:integrationTestCodeCoverageReport
           ./.github/scripts/run-zephyr-tests.sh test/C/src-gen
-          rm -r test/C/src-gen
+          rm -rf test/C/src-gen
       - name: Run basic tests
         run: |
           ./gradlew core:integrationTest --tests org.lflang.tests.runtime.CZephyrTest.buildBasic* core:integrationTestCodeCoverageReport
           ./.github/scripts/run-zephyr-tests.sh test/C/src-gen
-          rm -r test/C/src-gen
+          rm -rf test/C/src-gen
       - name: Run concurrent tests
         run: |
           ./gradlew core:integrationTest --tests org.lflang.tests.runtime.CZephyrTest.buildConcurrent* core:integrationTestCodeCoverageReport
           ./.github/scripts/run-zephyr-tests.sh test/C/src-gen
-          rm -r test/C/src-gen
+          rm -rf test/C/src-gen
       - name: Run Zephyr board tests
         run: |
           ./gradlew core:integrationTest --tests org.lflang.tests.runtime.CZephyrTest.buildZephyrBoards* core:integrationTestCodeCoverageReport
-          rm -r test/C/src-gen
+          rm -rf test/C/src-gen
       - name: Smoke test of lf-west-template
         run: |
           export LFC=$(pwd)/bin/lfc-dev