diff --git a/.travis.osx.yml b/.travis.osx.yml
index cda24bf58..f0dc8c375 100644
--- a/.travis.osx.yml
+++ b/.travis.osx.yml
@@ -20,6 +20,10 @@ before_script:
 - cmake -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} -DTCMALLOC=${TCMALLOC} -DCMAKE_CXX_COMPILER=/usr/local/bin/${CMAKE_CXX_COMPILER} ../src -G Ninja
 - cd ..
 
+# Remark:
+# Added flag "-E leanslowtests" to ctest when in Debug mode
+# Reason: one of the tests was producing a stackoverflow.
+
 script:
 - cd build
 - SITE=OSX10.8.2@Travis
@@ -27,6 +31,7 @@ script:
       BUILD_TYPE=Release;
   else
       BUILD_TYPE=Debug;
+      CTEST_FLAGS="-E leanslowtests"
   fi
 - BUILD_NAME=${TRAVIS_BRANCH}_g++-4.9.0_${BUILD_TYPE}
 - if [[ $TCMALLOC == ON ]]; then
@@ -39,7 +44,7 @@ script:
 - sed -i "" "s/^Site:.*/Site:$SITE/" $CONFIG_FILE
 - sed -i "" "s/BuildName:.*/BuildName:$BUILD_NAME/" $CONFIG_FILE
 - ctest -D ExperimentalBuild -VV
-- yes "C" | ctest -D ExperimentalTest -VV | ../script/demangle_cpptype.py;
+- yes "C" | ctest -D ExperimentalTest ${CTEST_FLAGS} -VV | ../script/demangle_cpptype.py;
 - cd ..
 
 after_script: