diff --git a/.travis.yml b/.travis.yml
index 3b942f3..f15a5d4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,7 +4,7 @@ language: java
 jdk: openjdk8
 
 script:
-  - ./gradlew build --stacktrace
+  - ./gradlew clean build --stacktrace
 
 before_cache:
   - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock