diff --git a/lib/embed/abort_.c b/lib/embed/abort_.c
index b54d08f2c9..a6df8143c3 100644
--- a/lib/embed/abort_.c
+++ b/lib/embed/abort_.c
@@ -1,5 +1,7 @@
 #include <py/runtime.h>
 
-void abort_(void) {
+NORETURN void abort_(void);
+
+NORETURN void abort_(void) {
     nlr_raise(mp_obj_new_exception_msg(&mp_type_RuntimeError, "abort() called"));
 }