diff --git a/core/admin/mailu/ui/templates/domain/create.html b/core/admin/mailu/ui/templates/domain/create.html
index bc407d27..f0d5308d 100644
--- a/core/admin/mailu/ui/templates/domain/create.html
+++ b/core/admin/mailu/ui/templates/domain/create.html
@@ -10,7 +10,7 @@
   {{ form.hidden_tag() }}
   {{ macros.form_field(form.name) }}
   {{ macros.form_fields((form.max_users, form.max_aliases)) }}
-  {{ macros.form_field(form.max_quota_bytes, step=10**9, max=50*10**9, data_infinity="true",
+  {{ macros.form_field(form.max_quota_bytes, step=50*10**6, max=50*10**9, data_infinity="true",
       prepend='<span class="input-group-text"><span id="max_quota_bytes_value"></span>&nbsp;GB</span>') }}
   {{ macros.form_field(form.signup_enabled) }}
   {{ macros.form_field(form.comment) }}
diff --git a/core/admin/mailu/ui/templates/user/create.html b/core/admin/mailu/ui/templates/user/create.html
index 9a32243d..5369621c 100644
--- a/core/admin/mailu/ui/templates/user/create.html
+++ b/core/admin/mailu/ui/templates/user/create.html
@@ -21,7 +21,7 @@
   {%- endcall %}
 
   {%- call macros.card(_("Features and quotas"), theme="success") %}
-  {{ macros.form_field(form.quota_bytes, step=1000000000, max=(max_quota_bytes or domain.max_quota_bytes or 50*10**9), data_infinity="true",
+  {{ macros.form_field(form.quota_bytes, step=50*10**6, max=(max_quota_bytes or domain.max_quota_bytes or 50*10**9), data_infinity="true",
       prepend='<span class="input-group-text"><span id="quota_bytes_value"></span>&nbsp;GB</span>') }}
   {{ macros.form_field(form.enable_imap) }}
   {{ macros.form_field(form.enable_pop) }}
diff --git a/towncrier/newsfragments/2242.misc b/towncrier/newsfragments/2242.misc
new file mode 100644
index 00000000..cc03e55e
--- /dev/null
+++ b/towncrier/newsfragments/2242.misc
@@ -0,0 +1 @@
+Make quotas adjustable in 50MiB increments