diff --git a/src/config-schema.coffee b/src/config-schema.coffee
index ba8150a26..f181e0149 100644
--- a/src/config-schema.coffee
+++ b/src/config-schema.coffee
@@ -108,6 +108,7 @@ module.exports =
         type: 'integer'
         default: 16
         minimum: 1
+        maximum: 100
       lineHeight:
         type: ['string', 'number']
         default: 1.3