diff --git a/.travis/mitogen_tests.sh b/.travis/mitogen_tests.sh
index 01e24963..db393d73 100755
--- a/.travis/mitogen_tests.sh
+++ b/.travis/mitogen_tests.sh
@@ -2,4 +2,4 @@
 # Run the Mitogen tests.
 
 MITOGEN_TEST_DISTRO="${DISTRO:-debian}"
-MITOGEN_LOG_LEVEL=debug PYTHONPATH=. ${TRAVIS_BUILD_DIR}/run_tests
+MITOGEN_LOG_LEVEL=debug PYTHONPATH=. ${TRAVIS_BUILD_DIR}/run_tests -vvv