diff --git a/assets/class_header_full.gui b/assets/class_header_full.gui
index b7431c3..87cdeb8 100644
--- a/assets/class_header_full.gui
+++ b/assets/class_header_full.gui
@@ -1,7 +1,7 @@
 Text (my-identifier) {
     text: "Hello, there!"
     font {
-        family: SansSerif
+        family: "SansSerif"
         pixelSize: 15
     }
     width: 200