diff --git a/moto/ecs/models.py b/moto/ecs/models.py
index f2518953161..18be8e7bcac 100644
--- a/moto/ecs/models.py
+++ b/moto/ecs/models.py
@@ -1693,6 +1693,9 @@ def update_service(self, service_properties: Dict[str, Any]) -> Service:
             for prop_name, prop_val in service_properties.items():
                 if prop_val is not None:
                     current_service.__setattr__(prop_name, prop_val)
+                    if prop_name == "desired_count":
+                        current_service.__setattr__("running_count", prop_val)
+                        current_service.__setattr__("pending_count", 0)
             if task_definition_str:
                 self.describe_task_definition(task_definition_str)
                 current_service.task_definition = task_definition_str
diff --git a/tests/test_ecs/test_ecs_boto3.py b/tests/test_ecs/test_ecs_boto3.py
index dd9295645d9..eb3ea0e13bf 100644
--- a/tests/test_ecs/test_ecs_boto3.py
+++ b/tests/test_ecs/test_ecs_boto3.py
@@ -1233,6 +1233,8 @@ def test_update_service():
         desiredCount=0,
     )
     assert response["service"]["desiredCount"] == 0
+    assert response["service"]["runningCount"] == 0
+    assert response["service"]["pendingCount"] == 0
     assert response["service"]["schedulingStrategy"] == "REPLICA"
 
     # Verify we can pass the ARNs of the cluster and service
@@ -1243,6 +1245,8 @@ def test_update_service():
         desiredCount=1,
     )
     assert response["service"]["desiredCount"] == 1
+    assert response["service"]["runningCount"] == 1
+    assert response["service"]["pendingCount"] == 0
 
 
 @mock_aws