diff --git a/travis-ci/travis-coveralls-report.sh b/travis-ci/travis-coveralls-report.sh
index 8411ecb..5ef727d 100755
--- a/travis-ci/travis-coveralls-report.sh
+++ b/travis-ci/travis-coveralls-report.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
-echo "TRAVIS: $TRAVIS"
-set
-if [ "$TRAVIS" = "true" ];then
+## Only send coveralls reports from Travis-CI. Some CIs, like Shippable, lie by setting TRAVIS=true.
+## Currently, Shippable, does not set TRAVIS_LANGUAGE, but Travis-CI does.
+if [ "$TRAVIS_LANGUAGE" = "java" ];then
     ./mvnw --projects builder,plugin test jacoco:report coveralls:report
 fi