diff --git a/atlas.json b/atlas.json
index a48cdb90..d66a60a3 100644
--- a/atlas.json
+++ b/atlas.json
@@ -33,7 +33,7 @@
     "epub": {
       "index": true,
       "toc": true,
-      "epubcheck": false,
+      "epubcheck": true,
       "embedded_fonts": [
         "fonts/DejaVuSerif.otf",
         "fonts/DejaVuSans-Bold.otf",