diff --git a/py/misc.h b/py/misc.h
index caa5945..5ac0f93 100644
--- a/py/misc.h
+++ b/py/misc.h
@@ -92,7 +92,7 @@
 void *m_realloc_maybe(void *ptr, size_t new_num_bytes, bool allow_move);
 void m_free(void *ptr);
 #endif
-void *m_malloc_fail(size_t num_bytes);
+NORETURN void *m_malloc_fail(size_t num_bytes);
 
 #if MICROPY_MEM_STATS
 size_t m_get_total_bytes_allocated(void);