diff --git a/.github/workflows/test-examples.yml b/.github/workflows/test-examples.yml
index 5d9b28ba..80f7c64c 100644
--- a/.github/workflows/test-examples.yml
+++ b/.github/workflows/test-examples.yml
@@ -63,13 +63,13 @@ jobs:
     needs: [build-runtime]
     container: 
       image: "manjusakalza/bpftime-base-image:${{matrix.container.image}}"
-      options: ${{matrix.extra_options}}
+      options: " ${{matrix.extra_options}}"
     strategy:
       fail-fast: false
       matrix:
         extra_options:
           - "--privileged -v /sys/kernel/debug/:/sys/kernel/debug:rw -v /sys/kernel/tracing:/sys/kernel/tracing:rw"
-          - null
+          - ""
         container:
           - image: ubuntu-2204
             name: ubuntu