diff --git a/lib/api/issues.rb b/lib/api/issues.rb
index 5f943ba27d1..b29c5848aef 100644
--- a/lib/api/issues.rb
+++ b/lib/api/issues.rb
@@ -8,7 +8,7 @@ module API
 
     helpers do
       def find_issues(args = {})
-        args = params.merge(args)
+        args = declared_params.merge(args)
 
         args.delete(:id)
         args[:milestone_title] = args.delete(:milestone)
diff --git a/lib/api/merge_requests.rb b/lib/api/merge_requests.rb
index d34886fca2e..c95e28edbef 100644
--- a/lib/api/merge_requests.rb
+++ b/lib/api/merge_requests.rb
@@ -8,7 +8,7 @@ module API
 
     helpers do
       def find_merge_requests(args = {})
-        args = params.merge(args)
+        args = declared_params.merge(args)
 
         args[:milestone_title] = args.delete(:milestone)
         args[:label_name] = args.delete(:labels)