diff --git a/Lib/fontTools/t1Lib/__init__.py b/Lib/fontTools/t1Lib/__init__.py
index 81938b5c7..7fafddfc3 100644
--- a/Lib/fontTools/t1Lib/__init__.py
+++ b/Lib/fontTools/t1Lib/__init__.py
@@ -265,7 +265,7 @@ def writeOther(path, data, dohex=False):
 			if code == 2 and dohex:
 				while chunk:
 					f.write(eexec.hexString(chunk[:hexlinelen]))
-					f.write('\r')
+					f.write(b'\r')
 					chunk = chunk[hexlinelen:]
 			else:
 				f.write(chunk)