diff --git a/.travis.yml b/.travis.yml
index eb66be022ec9..c01cd8b337d2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -100,7 +100,7 @@ script:
   - |
     if [[ $BUILD_DOCS == false ]]; then
       export MPL_REPO_DIR=$PWD  # needed for pep8-conformance test of the examples
-      gdb -return-child-result -batch -ex r -ex bt --args python tests.py -s --processes=$NPROC --process-timeout=300 $TEST_ARGS
+      gdb -return-child-result -batch -ex r -ex bt --args python tests.py --processes=$NPROC --process-timeout=300 $TEST_ARGS
     else
       cd doc
       python make.py html --small --warningsaserrors