diff --git a/lib/subsetLocalFont.js b/lib/subsetLocalFont.js
index 6face24e..05e76f01 100644
--- a/lib/subsetLocalFont.js
+++ b/lib/subsetLocalFont.js
@@ -18,7 +18,7 @@ const Promise = require('bluebird');
 const fs = require('fs');
 const getTemporaryFilePath = require('gettemporaryfilepath');
 
-const allowedFormats = ['woff', 'woff2'];
+const allowedFormats = ['ttf', 'woff', 'woff2'];
 
 const readFile = Promise.promisify(fs.readFile);
 const writeFile = Promise.promisify(fs.writeFile);
@@ -48,7 +48,6 @@ function subsetLocalFont(inputBuffer, format, text, ignoreMissingUnicodes) {
     tempInputFileName,
     `--output-file=${tempOutputFileName}`,
     '--obfuscate_names',
-    `--flavor=${format}`,
     `--text="${text.replace('"', '\\"')}"`
   ];
 
@@ -56,6 +55,10 @@ function subsetLocalFont(inputBuffer, format, text, ignoreMissingUnicodes) {
     args.push('--with-zopfli');
   }
 
+  if (format !== 'ttf') {
+    args.push(`--flavor=${format}`);
+  }
+
   return writeFile(tempInputFileName, inputBuffer)
     .then(result => execFile('pyftsubset', args))
     .catch(err => {