diff --git a/app/admin/support/ticket.rb b/app/admin/support/ticket.rb
index 0c8899686..3c029af76 100644
--- a/app/admin/support/ticket.rb
+++ b/app/admin/support/ticket.rb
@@ -26,7 +26,7 @@
     collection: -> { ticket_admins_collection(collection) },
     label: -> { Support::Ticket.human_attribute_name(:admin) }
   filter :priority, as: :select,
-    collection: -> { ticket_priority_marks_collection }
+    collection: -> { ticket_priority_filter_collection }
   filter :last_activity_at, as: :date_range
 
   includes :admin, :last_message
@@ -89,6 +89,7 @@
           f.input :priority,
             collection: ticket_priority_marks_collection,
             include_blank: false,
+            required: false,
             label: false,
             wrapper_html: { class: "support-ticket-priority" },
             input_html: {
diff --git a/app/helpers/support_helper.rb b/app/helpers/support_helper.rb
index 6e102079e..f5f98282d 100644
--- a/app/helpers/support_helper.rb
+++ b/app/helpers/support_helper.rb
@@ -12,12 +12,18 @@ def ticket_admins_collection(relation = nil)
 
   def ticket_priority_marks_collection
     [
-      [ "", Support::Ticket.priorities[:normal] ],
-      [ Support::Ticket::PRIORITY_ICONS[:medium], Support::Ticket.priorities[:medium] ],
-      [ Support::Ticket::PRIORITY_ICONS[:high], Support::Ticket.priorities[:high] ]
+      [ "", :normal ],
+      [ Support::Ticket::PRIORITY_ICONS[:medium], :medium ],
+      [ Support::Ticket::PRIORITY_ICONS[:high], :high ]
     ]
   end
 
+  def ticket_priority_filter_collection
+    ticket_priority_marks_collection.map { |label, key|
+      [ label, Support::Ticket.priorities[key] ]
+    }
+  end
+
   def support_message_html(message)
     html = if message.html.present?
       message.html.to_s
diff --git a/app/models/support/ticket.rb b/app/models/support/ticket.rb
index 10a2021e2..579d22b70 100644
--- a/app/models/support/ticket.rb
+++ b/app/models/support/ticket.rb
@@ -10,7 +10,7 @@ class Ticket < ApplicationRecord
     include HasAttachments
     has_rich_text :html
 
-    enum :priority, %i[normal medium high]
+    enum :priority, %i[normal medium high], validate: true
 
     belongs_to :admin, optional: true
     has_many :messages, class_name: "Support::Message",
diff --git a/test/controllers/support_tickets_controller_test.rb b/test/controllers/support_tickets_controller_test.rb
index 47b321621..c4cdae580 100644
--- a/test/controllers/support_tickets_controller_test.rb
+++ b/test/controllers/support_tickets_controller_test.rb
@@ -110,9 +110,9 @@ def login(admin)
     assert_select "label[for=support_ticket_priority]", count: 0
     assert_select "#support_ticket_subject_input .inline-hints", count: 0
     assert_select "select[name='support_ticket[priority]']" do
-      assert_select "option[value=?]", Support::Ticket.priorities[:normal], text: ""
-      assert_select "option[value=?]", Support::Ticket.priorities[:medium], text: Support::Ticket::PRIORITY_ICONS[:medium]
-      assert_select "option[value=?]", Support::Ticket.priorities[:high], text: Support::Ticket::PRIORITY_ICONS[:high]
+      assert_select "option[value=?]", "normal", text: ""
+      assert_select "option[value=?]", "medium", text: Support::Ticket::PRIORITY_ICONS[:medium]
+      assert_select "option[value=?]", "high", text: Support::Ticket::PRIORITY_ICONS[:high]
     end
 
     post support_tickets_path, params: {
@@ -145,6 +145,40 @@ def login(admin)
     assert_equal "Checkout fails", ticket.messages.first.body
   end
 
+  test "create accepts high priority from the form enum name" do
+    login admins(:external)
+
+    post support_tickets_path, params: {
+      support_ticket: {
+        priority: "high",
+        subject: "Broken shop",
+        html: "<div>Checkout fails</div>"
+      }
+    }
+
+    ticket = Support::Ticket.order(:id).last
+    assert_redirected_to support_ticket_path(ticket)
+    assert_equal "high", ticket.priority
+  end
+
+  test "create with a numeric priority string re-renders instead of raising" do
+    login admins(:external)
+
+    assert_no_difference "Support::Ticket.count" do
+      post support_tickets_path, params: {
+        support_ticket: {
+          priority: "2",
+          subject: "Broken shop",
+          html: "<div>Checkout fails</div>"
+        }
+      }
+    end
+
+    assert_response :unprocessable_entity
+    assert_select "#support_ticket_priority_input.error"
+    assert_includes response.body, I18n.t("errors.messages.inclusion")
+  end
+
   test "show includes the thread and reply box" do
     ticket = Support::Ticket.create!(
       priority: :normal, subject: "Need help", content: "Opening", admin: admins(:external))
diff --git a/test/models/support/ticket_test.rb b/test/models/support/ticket_test.rb
index 631e208fa..b983899df 100644
--- a/test/models/support/ticket_test.rb
+++ b/test/models/support/ticket_test.rb
@@ -3,6 +3,28 @@
 require "test_helper"
 
 class Support::TicketTest < ActiveSupport::TestCase
+  test "invalid priority is a validation error instead of ArgumentError" do
+    ticket = Support::Ticket.new(
+      priority: "2",
+      subject: "Test",
+      content: "Test",
+      admin: admins(:external))
+
+    assert_not ticket.valid?
+    assert_includes ticket.errors[:priority], I18n.t("errors.messages.inclusion")
+  end
+
+  test "priority accepts enum names" do
+    ticket = Support::Ticket.new(
+      subject: "Test",
+      content: "Test",
+      admin: admins(:external))
+
+    ticket.priority = "high"
+    assert ticket.high?
+    assert ticket.valid?
+  end
+
   test "subject_decorated" do
     ticket = Support::Ticket.new(
       priority: :normal,