diff --git a/keyboards/zsa/common/config.h b/keyboards/zsa/common/config.h
index 9d3cfbc8e1..001d39c3a8 100644
--- a/keyboards/zsa/common/config.h
+++ b/keyboards/zsa/common/config.h
@@ -5,7 +5,7 @@
 
 #ifdef ORYX_ENABLE
 #    ifndef SERIAL_NUMBER
-#        define SERIAL_NUMBER default/latest
+#        define SERIAL_NUMBER "default/latest"
 #    endif // SERIAL_NUMBER
 #    ifndef RAW_USAGE_PAGE
 #        define RAW_USAGE_PAGE 0xFF60