diff --git a/roles/pretalx/meta/argument_specs.yml b/roles/pretalx/meta/argument_specs.yml
index 38dccd6..1d81cd9 100644
--- a/roles/pretalx/meta/argument_specs.yml
+++ b/roles/pretalx/meta/argument_specs.yml
@@ -164,13 +164,11 @@ argument_specs:
           - If present, the username Pretalx uses to send e-mail.
           - "Only takes effect if O(pretalx_mail_password) is set as well."
         type: str
-        default: null
       pretalx_mail_password:
         description:
           - If present, the password Pretalx uses to send e-mail.
           - "Only takes effect if O(pretalx_mail_username) is set as well."
         type: str
-        default: null
 
       # pretalx.cfg: redis config section
       pretalx_valkey_db_offset:
diff --git a/roles/pretix/meta/argument_specs.yml b/roles/pretix/meta/argument_specs.yml
index 6d6b5d1..705ac19 100644
--- a/roles/pretix/meta/argument_specs.yml
+++ b/roles/pretix/meta/argument_specs.yml
@@ -174,13 +174,11 @@ argument_specs:
           - If present, the username Pretix uses to send e-mail.
           - "Only takes effect if O(pretix_mail_password) is set as well."
         type: str
-        default: null
       pretix_mail_password:
         description:
           - If present, the password Pretix uses to send e-mail.
           - "Only takes effect if O(pretix_mail_username) is set as well."
         type: str
-        default: null
 
       # pretix.cfg: redis config section
       pretix_valkey_db_offset: