diff --git a/src/rp2_common/pico_btstack/btstack_flash_bank.c b/src/rp2_common/pico_btstack/btstack_flash_bank.c
index 9ed9c0228..54111ff74 100644
--- a/src/rp2_common/pico_btstack/btstack_flash_bank.c
+++ b/src/rp2_common/pico_btstack/btstack_flash_bank.c
@@ -7,6 +7,7 @@
 #include "pico/btstack_flash_bank.h"
 #include "pico/flash.h"
 #include "hardware/sync.h"
+#include "hardware/flash.h"
 #include <string.h>
 
 // Check sizes