diff --git a/src/lucky/support/message_verifier.cr b/src/lucky/support/message_verifier.cr
index d8b3eab8b..b4a145d94 100644
--- a/src/lucky/support/message_verifier.cr
+++ b/src/lucky/support/message_verifier.cr
@@ -39,7 +39,7 @@ module Lucky
     end
 
     private def encode(data) : String
-      ::Base64.strict_encode(data)
+      ::Base64.urlsafe_encode(data)
     end
 
     private def decode(data) : Bytes