diff --git a/src/prepro/data_builder.py b/src/prepro/data_builder.py
index 31b80af7..60c883e4 100644
--- a/src/prepro/data_builder.py
+++ b/src/prepro/data_builder.py
@@ -31,7 +31,6 @@ def load_json(p, lower):
             continue
         if (flag):
             tgt.append(tokens)
-            flag = False
         else:
             source.append(tokens)