diff --git a/pico_keyer.cpp b/pico_keyer.cpp
index 347d25a..7ee3990 100644
--- a/pico_keyer.cpp
+++ b/pico_keyer.cpp
@@ -1,7 +1,10 @@
 #include <stdio.h>
 #include "pico/stdlib.h"
+#include "hardware/flash.h"
 
-
+namespace {
+    static uint16_t PAGE_SIZE{256};
+}
 
 int main()
 {