diff --git a/.travis.yml b/.travis.yml
index 78f4380..9ca6f63 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,7 +12,7 @@ git:
 
 cache:
   directories:
-    ${CACHE_DIR}
+    - ${CACHE_DIR}
 
 jobs:
   include: