diff --git a/_config.yml b/_config.yml
index 8bc177b275..4e009b8f66 100644
--- a/_config.yml
+++ b/_config.yml
@@ -11,7 +11,7 @@ permalink: pretty
 safe: false
 lsi: false
 url: https://docs.docker.com
-keep_files: ["v1.4", "v1.5", "v1.6", "v1.7", "v1.8", "v1.9", "v1.10", "v1.11", "v1.12", "v1.13" "v17.03"]
+keep_files: ["v1.4", "v1.5", "v1.6", "v1.7", "v1.8", "v1.9", "v1.10", "v1.11", "v1.12", "v1.13", "v17.03"]
 compose_current: 1.14.0
 
 gems: