diff --git a/Tests/ttLib/tables/ttProgram_test.py b/Tests/ttLib/tables/ttProgram_test.py
index 384cefba8..9a7d232c2 100644
--- a/Tests/ttLib/tables/ttProgram_test.py
+++ b/Tests/ttLib/tables/ttProgram_test.py
@@ -106,7 +106,7 @@ class ProgramTest(unittest.TestCase):
         p.fromBytecode(BYTECODE)
         ttfont = TestFont()
         buf = UnicodeIO()
-        writer = XMLWriter(buf)
+        writer = XMLWriter(buf, newlinestr='\n')
         try:
             p.toXML(writer, ttfont)
         finally: