diff --git a/fonts.js b/fonts.js
index 1d2a5f755..9b3b01dc0 100755
--- a/fonts.js
+++ b/fonts.js
@@ -1408,7 +1408,7 @@ var Type1Parser = function() {
       subrs: [],
       charstrings: [],
       properties: {
-        private: {}
+        'private': {}
       }
     };