diff --git a/test/travis-ci/base_test.sh b/test/travis-ci/base_test.sh
index 14fd9e50e..7ad617295 100755
--- a/test/travis-ci/base_test.sh
+++ b/test/travis-ci/base_test.sh
@@ -7,7 +7,7 @@ else
   # Mac OS X test
   source setup-env.sh
   pushd test
-    runtest.py
+    python runtest.py
     python array_test.py
     python microbenchmarks.py
   popd