diff --git a/app/boards/shields/tester_xiao/tester_xiao.overlay b/app/boards/shields/tester_xiao/tester_xiao.overlay
index f0fc8977cf3..48461d73e70 100644
--- a/app/boards/shields/tester_xiao/tester_xiao.overlay
+++ b/app/boards/shields/tester_xiao/tester_xiao.overlay
@@ -1,3 +1,5 @@
+#include <dt-bindings/zmk/matrix_transform.h>
+
 / {
     chosen {
         zmk,kscan = &kscan0;