diff --git a/weed/iamapi/iamapi_management_handlers.go b/weed/iamapi/iamapi_management_handlers.go
index 54c06f47b..7793f4547 100644
--- a/weed/iamapi/iamapi_management_handlers.go
+++ b/weed/iamapi/iamapi_management_handlers.go
@@ -289,6 +289,12 @@ func (iama *IamApiServer) UpdateUser(s3cfg *iam_pb.S3ApiConfiguration, values ur
 				}
 				// Update group membership references
 				updateUserInGroups(s3cfg, userName, newUserName)
+				// Update service account parent references
+				for _, sa := range s3cfg.ServiceAccounts {
+					if sa.ParentUser == userName {
+						sa.ParentUser = newUserName
+					}
+				}
 				return resp, nil
 			}
 		}