diff --git a/src/rules/index.js b/src/rules/index.js
index <HASH>..<HASH> 100644
--- a/src/rules/index.js
+++ b/src/rules/index.js
@@ -3,5 +3,6 @@ export default {
   "block-opening-brace-before": require("./block-opening-brace-before"),
   "declaration-block-trailing-semicolon": require("./declaration-block-trailing-semicolon"),
   "declaration-no-important": require("./declaration-no-important"),
+  "number-leading-zero": require("./number-leading-zero"),
   "rule-set-no-single-line": require("./rule-set-no-single-line"),
 }
Add number-leading-zero to rule index