diff --git a/changelogs/unreleased/55109-jira-integration-api-doesn-t-respect-available-format.yml b/changelogs/unreleased/55109-jira-integration-api-doesn-t-respect-available-format.yml
new file mode 100644
index 00000000000..c58cdc19555
--- /dev/null
+++ b/changelogs/unreleased/55109-jira-integration-api-doesn-t-respect-available-format.yml
@@ -0,0 +1,5 @@
+---
+title: 'API: Support Jira transition ID as string'
+merge_request: 24400
+author: Robert Schilling
+type: fixed
diff --git a/lib/api/services.rb b/lib/api/services.rb
index 637b5a8a89a..e83d7c944e4 100644
--- a/lib/api/services.rb
+++ b/lib/api/services.rb
@@ -468,7 +468,7 @@ module API
         {
           required: false,
           name: :jira_issue_transition_id,
-          type: Integer,
+          type: String,
           desc: 'The ID of a transition that moves issues to a closed state. You can find this number under the JIRA workflow administration (**Administration > Issues > Workflows**) by selecting **View** under **Operations** of the desired workflow of your project. The ID of each state can be found inside the parenthesis of each transition name under the **Transitions (id)** column ([see screenshot][trans]). By default, this ID is set to `2`'
         }
       ],