diff --git a/.github/workflows/cargo_audit.yml b/.github/workflows/cargo_audit.yml
index 32338d69fe4373a8fc4c8eb0965fc77dd87c0003..584dc2068ec1dd0d7c65a47481442e459feb7e30 100644
--- a/.github/workflows/cargo_audit.yml
+++ b/.github/workflows/cargo_audit.yml
@@ -6,6 +6,7 @@ on:
 jobs:
   audit:
     runs-on: ubuntu-18.04
+    if: env.GITHUB_HEAD_REF == 0
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1