diff --git a/label_studio/core/feature_flags/stale_feature_flags.py b/label_studio/core/feature_flags/stale_feature_flags.py
index 913f9ed5fd7d..f6d8f45af707 100644
--- a/label_studio/core/feature_flags/stale_feature_flags.py
+++ b/label_studio/core/feature_flags/stale_feature_flags.py
@@ -37,7 +37,6 @@
     'fflag_fix_front_dev_3617_taxonomy_memory_leaks_fix': True,
     'ff_back_dev_2915_storage_nginx_proxy_26092022_short': True,
     'fflag_fix_front_dev_3350_restrict_drawing_area_short': True,
-    'fix_back_dev_3351_ml_validation_error_extension_short': False,
     'fflag_feat_front_dev_2984_dm_draggable_columns_short': True,
     'fflag_feat_front_dev_2461_audio_paragraphs_seek_chunk_position_short': True,
     'fflag-feat-front-dev-2982-label-weights-settings': True,
diff --git a/label_studio/ml/api_connector.py b/label_studio/ml/api_connector.py
index 615693715049..ac938bca7abf 100644
--- a/label_studio/ml/api_connector.py
+++ b/label_studio/ml/api_connector.py
@@ -159,11 +159,7 @@ def _request(self, url_suffix, request=None, verbose=True, method='POST', *args,
                 response = self.get(url=url, *args, **kwargs)
             response.raise_for_status()
         except requests.exceptions.RequestException as e:
-            # Extending error details in case of failed request
-            if flag_set('fix_back_dev_3351_ml_validation_error_extension_short', AnonymousUser):
-                error_string = str(e) + (' ' + str(response.text) if response else '')
-            else:
-                error_string = str(e)
+            error_string = str(e)
             status_code = response.status_code if response is not None else 0
             return MLApiResult(url, request, {'error': error_string}, headers, 'error', status_code=status_code)
         status_code = response.status_code