diff --git a/.travis.yml b/.travis.yml
index 55e251a..ea02b6f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,4 +12,4 @@ before_install:
 install:
   - ./setup-ant.sh
 script:
-  - ant debug
+  - lint -w --exitcode --disable MissingTranslation . && ant debug
diff --git a/lint.xml b/lint.xml
index 7edd00c..cd410d4 100644
--- a/lint.xml
+++ b/lint.xml
@@ -1,4 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <lint>
+    <issue id="all">
+        <ignore path="external/**" />
+    </issue>
     <issue id="NewApi" severity="ignore" />
-</lint>
\ No newline at end of file
+</lint>