diff --git a/lib/mozilla_iam/authenticator.rb b/lib/mozilla_iam/authenticator.rb
index 14dbcbf..5e4f52b 100644
--- a/lib/mozilla_iam/authenticator.rb
+++ b/lib/mozilla_iam/authenticator.rb
@@ -58,6 +58,7 @@ module MozillaIAM
         SiteSetting.auth0_domain,
         {
           authorize_params: {
+            action: "signup",
             scope: 'openid name email'
           }
         }