diff --git a/src/util.ts b/src/util.ts
index 5038ef6..83ff194 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -26,7 +26,7 @@ function falseOnEnoent(e: any) {
 }
 
 function padRight(str: string, l: number) {
-  return (str + ' '.repeat(l)).substr(0, l)
+  return (str + ' '.repeat(l)).slice(0, l)
 }
 
 const bound: MethodDecorator = function bound<T>(