Further fixup to cf75a7c5d05b96df6c6cacde3fdc53e8e6cb200d
diff --git a/Lib/fontTools/ttx.py b/Lib/fontTools/ttx.py
index d649c38..4621d6a 100644
--- a/Lib/fontTools/ttx.py
+++ b/Lib/fontTools/ttx.py
@@ -90,9 +90,7 @@
 	if outputDir:
 		dir = outputDir
 	output = os.path.join(dir, file + extension)
-	m = numberAddedRE.split(file)
-	if len(m) > 1:
-		file = m[0]
+	file = numberAddedRE.split(file)[0]
 	n = 1
 	while os.path.exists(output):
 		output = os.path.join(dir, file + "#" + repr(n) + extension)