diff --git a/pyaccuwage/__init__.py b/pyaccuwage/__init__.py
index d438817..3db24fc 100644
--- a/pyaccuwage/__init__.py
+++ b/pyaccuwage/__init__.py
@@ -58,6 +58,8 @@ def loads(s, record_types=get_record_types()):
 
 
 def dump(fp, records, delim=None):
+    if type(delim) is str:
+        delim = delim.encode('ascii')
     for r in records:
         fp.write(r.output())
         if delim:
diff --git a/tests/test_records.py b/tests/test_records.py
index dfa25fa..166b6d5 100644
--- a/tests/test_records.py
+++ b/tests/test_records.py
@@ -90,7 +90,8 @@ class TestFileFormats(unittest.TestCase):
         record_identifier = 'B'  # 1 byte
         zero1 = ZeroField(max_length=32)
         text1 = TextField(max_length=71)
-        blank2 = BlankField(max_length=24)
+        text2 = TextField(max_length=20)
+        blank2 = BlankField(max_length=4)
 
     record_types = [TestModelA, TestModelB]