diff --git a/.travis.yml b/.travis.yml
index 1d54d46f0..40dbaa440 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -51,7 +51,7 @@ script:
   - cd ../
 # use same hack as for clang to work around cppchecks broken exit status with -j 2 ; create file, tee everything to the file and stdout, grep for errors in the file
   - touch /tmp/cppcheck.cppcheck
-  - ./cppcheck --error-exitcode=1 -Ilib --enable=style,performance,portability,warning,internal --exception-handling --suppressions-list=.travis_suppressions -itest/synthetic -iaddons . -j 2 |& tee /tmp/cppcheck.cppcheck
+  - ./cppcheck --error-exitcode=1 -Ilib -Iexternals/simplecpp/ -Iexternals/tinyxml/ -Icli --enable=style,performance,portability,warning,internal --exception-handling --suppressions-list=.travis_suppressions -itest/synthetic -iaddons . -j 2 |& tee /tmp/cppcheck.cppcheck
   - sh -c "! grep '^\[' /tmp/cppcheck.cppcheck"
 # run extra tests
   - tools/generate_and_run_more_tests.sh