1 files changed, 6 insertions, 2 deletions
diff --git a/sql/item_sum.h b/sql/item_sum.h
index d7753303f55..4cded41a9f6 100644
--- a/sql/item_sum.h
+++ b/sql/item_sum.h
@@ -735,8 +735,12 @@ class Item_func_group_concat : public Item_sum
   }
   longlong val_int()
   {
-    String *res;  res=val_str(&str_value);
-    return res ? strtoll(res->c_ptr(),(char**) 0,10) : (longlong) 0;
+    String *res;
+    char *end_ptr;
+    int error;
+    res= val_str(&str_value);
+    end_ptr= (char*) res->ptr()+ res->length();
+    return res ? my_strtoll10(res->ptr(), &end_ptr, &error) : (longlong) 0;
   }
   String* val_str(String* str);
   Item *copy_or_same(THD* thd);