diff --git a/.travis.yml b/.travis.yml
index eb8db55c76872aafef7c1366b9c8f741e5a49c5c..b2f2c51c024d5b037c944c298aa9d5f103df0980 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,8 +6,9 @@ before_install:
 <<<<<<< HEAD
 script:
   - ./tools/run_tests/run_tests.py -l c -t -j 16 -c dbg
-  - ./tools/run_tests/run_tests.py -l c -t -j 16 -c opt
   - ./tools/run_tests/run_tests.py -l c++ -t -j 16 -c dbg
+  - make clean
+  - ./tools/run_tests/run_tests.py -l c -t -j 16 -c opt
   - ./tools/run_tests/run_tests.py -l c++ -t -j 16 -c opt
   - ./tools/run_tests/run_tests.py -l node -t -j 16 -c opt
   - ./tools/run_tests/run_tests.py -l python -t -j 1 -c opt