diff --git a/packages/dynamite/lib/src/openapi_builder.dart b/packages/dynamite/lib/src/openapi_builder.dart
index 272a4b8f..a6088b06 100644
--- a/packages/dynamite/lib/src/openapi_builder.dart
+++ b/packages/dynamite/lib/src/openapi_builder.dart
@@ -1284,10 +1284,10 @@ TypeResult resolveType(
                             '}',
                           ],
                           if (schema.oneOf != null) ...[
-                            "assert([${fields.values.join(',')}].where((final x) => x != null).length == 1, 'Need oneOf');",
+                            "assert([${fields.values.join(',')}].where((final x) => x != null).length == 1, 'Need oneOf for \$data');",
                           ],
                           if (schema.allOf != null) ...[
-                            "assert([${fields.values.join(',')}].where((final x) => x != null).length == ${fields.length}, 'Need allOf');",
+                            "assert([${fields.values.join(',')}].where((final x) => x != null).length == ${fields.length}, 'Need allOf for \$data');",
                           ],
                           'return $identifier(',
                           'data,',
diff --git a/packages/nextcloud/lib/src/nextcloud.openapi.dart b/packages/nextcloud/lib/src/nextcloud.openapi.dart
index 59a224c0..44a267c5 100644
--- a/packages/nextcloud/lib/src/nextcloud.openapi.dart
+++ b/packages/nextcloud/lib/src/nextcloud.openapi.dart
@@ -2821,7 +2821,7 @@ class CoreNavigationApps_Ocs_Data_Order {
     try {
       string = (data as String);
     } catch (_) {}
-    assert([$int, string].where((final x) => x != null).length == 1, 'Need oneOf');
+    assert([$int, string].where((final x) => x != null).length == 1, 'Need oneOf for $data');
     return CoreNavigationApps_Ocs_Data_Order(
       data,
       $int: $int,
@@ -3968,7 +3968,7 @@ class UserStatusClearAt_Time {
     try {
       $int = (data as int);
     } catch (_) {}
-    assert([userStatusClearAtTime0, $int].where((final x) => x != null).length == 1, 'Need oneOf');
+    assert([userStatusClearAtTime0, $int].where((final x) => x != null).length == 1, 'Need oneOf for $data');
     return UserStatusClearAt_Time(
       data,
       userStatusClearAtTime0: userStatusClearAtTime0,