diff --git a/src/config-schema.coffee b/src/config-schema.coffee
index 74fc719a4..92d80069f 100644
--- a/src/config-schema.coffee
+++ b/src/config-schema.coffee
@@ -152,6 +152,7 @@ module.exports =
       softWrapHangingIndentationSpaces:
         type: 'integer'
         default: 0
+        minimum: 0
       scrollSensitivity:
         type: 'integer'
         default: 40