diff --git a/mms/service.py b/mms/service.py
index 1ebe47cc0..8f7c0bc95 100644
--- a/mms/service.py
+++ b/mms/service.py
@@ -112,9 +112,9 @@ def predict(self, batch):
         except MemoryError:
             logger.error("System out of memory", exc_info=True)
             return create_predict_response(None, req_id_map, "Out of resources", 507)
-        except Exception:  # pylint: disable=broad-except
+        except Exception as e:  # pylint: disable=broad-except
             logger.warning("Invoking custom service failed.", exc_info=True)
-            return create_predict_response(None, req_id_map, "Prediction failed", 503)
+            return create_predict_response(None, req_id_map, "Prediction failed : [{}]".format(e), 503)
 
         if not isinstance(ret, list):
             logger.warning("model: %s, Invalid return type: %s.", self.context.model_name, type(ret))