diff --git a/bootloaders/encrypted/hello_serial.c b/bootloaders/encrypted/hello_serial.c
index 9b7cceb23..d8af4e97b 100644
--- a/bootloaders/encrypted/hello_serial.c
+++ b/bootloaders/encrypted/hello_serial.c
@@ -6,8 +6,10 @@
 
 #include <stdio.h>
 #include "pico/stdlib.h"
+#include "hardware/sync.h"
 
 int main() {
+    enable_interrupts();
     stdio_init_all();
     while (true) {
         printf("Hello, world!\n");