diff --git a/src/core/fonts.js b/src/core/fonts.js
index 19210e02f..61d11af24 100644
--- a/src/core/fonts.js
+++ b/src/core/fonts.js
@@ -89,8 +89,6 @@ const EXPORT_DATA_PROPERTIES = [
   "fallbackName",
   "fontMatrix",
   "fontType",
-  "isMonospace",
-  "isSerifFont",
   "isType3Font",
   "italic",
   "loadedName",
@@ -107,6 +105,8 @@ const EXPORT_DATA_EXTRA_PROPERTIES = [
   "cMap",
   "defaultEncoding",
   "differences",
+  "isMonospace",
+  "isSerifFont",
   "isSymbolicFont",
   "seacMap",
   "toFontChar",