diff --git a/.ci/run-coveralls.sh b/.ci/run-coveralls.sh
index 59b4c56d4..8d1ceb5e2 100755
--- a/.ci/run-coveralls.sh
+++ b/.ci/run-coveralls.sh
@@ -3,6 +3,8 @@
 set -x
 set -o errexit -o nounset
 
+if test x"$TRAVIS_REPO_SLUG" != x"harfbuzz/harfbuzz"; then exit; fi
+
 pip install --user nose
 pip install --user cpp-coveralls
 export PATH=$HOME/.local/bin:$PATH