diff --git a/lib/mpw/mpw.rb b/lib/mpw/mpw.rb
index d09e9bd..ffdccff 100644
--- a/lib/mpw/mpw.rb
+++ b/lib/mpw/mpw.rb
@@ -321,7 +321,7 @@ class MPW
     chars = [*('A'..'Z'), *('a'..'z'), *('0'..'9')] if chars.empty?
 
     result = ''
-    while length > 62 do
+    while length > 62
       result << chars.sample(62).join
       length -= 62
     end