diff --git a/binaries/data/mods/mod/gui/gui.rng b/binaries/data/mods/mod/gui/gui.rng
index e6c035bff0..f79463fb3f 100644
--- a/binaries/data/mods/mod/gui/gui.rng
+++ b/binaries/data/mods/mod/gui/gui.rng
@@ -89,7 +89,7 @@
   </define>
   <define name="font">
     <data type="string">
-      <param name="pattern">(mono|sans)-(bold-|italic-)?(stroke-)?[0-9]{1,3}</param>
+      <param name="pattern">[a-z]+-(bold-|italic-)?(stroke-)?[0-9]{1,3}</param>
     </data>
   </define>
   <define name="size">