diff --git a/.travis.yml b/.travis.yml
index 4e8f745..2e1239e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,5 +10,6 @@ addons:
       - libgmp-dev
 script:
   - make test DEBUG=1 -j3
+  - make clean
   - make test_go