diff --git a/lib/active_job/concurrency_controls.rb b/lib/active_job/concurrency_controls.rb
index e17edd13..a93f078e 100644
--- a/lib/active_job/concurrency_controls.rb
+++ b/lib/active_job/concurrency_controls.rb
@@ -4,7 +4,6 @@ module ActiveJob
   module ConcurrencyControls
     extend ActiveSupport::Concern
 
-    DEFAULT_CONCURRENCY_KEY = ->(*args) { args&.first }
     DEFAULT_CONCURRENCY_GROUP = ->(*) { self.class.name }
 
     included do
@@ -16,11 +15,11 @@ module ConcurrencyControls
     end
 
     class_methods do
-      def limits_concurrency(to: 1, key: DEFAULT_CONCURRENCY_KEY, group: DEFAULT_CONCURRENCY_GROUP, duration: SolidQueue.default_concurrency_control_period)
-        self.concurrency_limit = to
+      def limits_concurrency(key:, to: 1, group: DEFAULT_CONCURRENCY_GROUP, duration: SolidQueue.default_concurrency_control_period)
         self.concurrency_key = key
-        self.concurrency_duration = duration
+        self.concurrency_limit = to
         self.concurrency_group = group
+        self.concurrency_duration = duration
       end
     end
 
diff --git a/test/models/solid_queue/job_test.rb b/test/models/solid_queue/job_test.rb
index a936a9c7..feb6d0e4 100644
--- a/test/models/solid_queue/job_test.rb
+++ b/test/models/solid_queue/job_test.rb
@@ -2,18 +2,18 @@
 
 class SolidQueue::JobTest < ActiveSupport::TestCase
   class NonOverlappingJob < ApplicationJob
-    limits_concurrency # Using all defaults
+    limits_concurrency key: ->(job_result) { job_result }
 
     def perform(job_result)
     end
   end
 
   class NonOverlappingGroupedJob1 < NonOverlappingJob
-    limits_concurrency group: "MyGroup"
+    limits_concurrency key: ->(job_result) { job_result }, group: "MyGroup"
   end
 
   class NonOverlappingGroupedJob2 < NonOverlappingJob
-    limits_concurrency group: "MyGroup"
+    limits_concurrency key: ->(job_result) { job_result }, group: "MyGroup"
   end
 
   setup do