diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e65e630b15..050c8e287b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -120,7 +120,7 @@ jobs:
       - name: after_success
         shell: bash
         run: |
-          cpp-coveralls -i src -i include --exclude-pattern "/usr/*" --dump cpp_cov.json
+          cpp-coveralls -i src -i include -e src/external --exclude-pattern "/usr/*" --dump cpp_cov.json
           coveralls --merge=cpp_cov.json --service=github
 
   finish: