diff --git a/awx/api/views/__init__.py b/awx/api/views/__init__.py
index 87140b02b1..a1279a9119 100644
--- a/awx/api/views/__init__.py
+++ b/awx/api/views/__init__.py
@@ -3154,8 +3154,11 @@ class WorkflowJobRelaunch(WorkflowsEnforcementMixin, GenericAPIView):
 
     def post(self, request, *args, **kwargs):
         obj = self.get_object()
-        if obj.is_sliced_job and not obj.job_template_id:
-            raise ParseError(_('Cannot relaunch slice workflow job orphaned from job template.'))
+        if obj.is_sliced_job:
+            if not obj.job_template_id:
+                raise ParseError(_('Cannot relaunch slice workflow job orphaned from job template.'))
+            elif obj.job_template.job_slice_count != obj.workflow_nodes.count():
+                raise ParseError(_('Cannot relaunch sliced workflow job after slice count has changed.'))
         new_workflow_job = obj.create_relaunch_workflow_job()
         new_workflow_job.signal_start()