diff --git a/src/rp2_common/pico_flash/flash.c b/src/rp2_common/pico_flash/flash.c
index 0d5606748..9453040ec 100644
--- a/src/rp2_common/pico_flash/flash.c
+++ b/src/rp2_common/pico_flash/flash.c
@@ -9,6 +9,7 @@
 #if PICO_FLASH_SAFE_EXECUTE_PICO_SUPPORT_MULTICORE_LOCKOUT
 #include "pico/multicore.h"
 #endif
+#include "pico/time.h"
 #if PICO_FLASH_SAFE_EXECUTE_SUPPORT_FREERTOS_SMP
 #include "FreeRTOS.h"
 #include "task.h"