diff --git a/lib/include/isr.h b/lib/include/isr.h
index 1647e3b8a..a63215ce8 100644
--- a/lib/include/isr.h
+++ b/lib/include/isr.h
@@ -130,6 +130,23 @@ enum interrupt_nums {
 
 #endif /* REG_NO_COMPAT */
 
+/* Macro to safely disable all interrupts for a block of code.
+   Use it like this:
+   disable_int({
+       asdf = 1234;
+       printf("hi\r\n");
+   });
+*/
+#define __int_top() volatile uint32_t saved_intenable
+#define __int_disable() saved_intenable = ITC->INTENABLE; ITC->INTENABLE = 0
+#define __int_enable() ITC->INTENABLE = saved_intenable
+#define disable_int(x) do { \
+        __int_top(); \
+        __int_disable(); \
+        x; \
+        __int_enable(); } while(0)
+
+
 extern void tmr0_isr(void) __attribute__((weak));
 extern void tmr1_isr(void) __attribute__((weak));
 extern void tmr2_isr(void) __attribute__((weak));