diff --git a/.github/workflows/code_coverage.yaml b/.github/workflows/code_coverage.yaml
index 0e069fa1..d19be9f4 100644
--- a/.github/workflows/code_coverage.yaml
+++ b/.github/workflows/code_coverage.yaml
@@ -93,6 +93,9 @@ jobs:
       run: docker exec code_coverage bash -c "cd /root/occlum/demos/linux-ltp && ./dl_and_build_ltp.sh && SGX_MODE=SIM ./prepare_ltp.sh;
             cd ltp_instance;
             occlum run /opt/ltp/run-ltp.sh -f syscalls-occlum"
+    
+    - name: Clean demos
+      run: docker exec code_coverage bash -c "rm -rf /root/occlum/demos/"
 
     - name : Gvisor syscall test
       run: docker exec code_coverage bash -c "git clone -b occlum-release-20200921.0 https://github.com/occlum/gvisor.git;