diff --git a/rand.c b/rand.c
index 8a288c9835..975bf18d5b 100644
--- a/rand.c
+++ b/rand.c
@@ -66,7 +66,7 @@ uint32_t random_uniform(uint32_t n)
 	return x / (max / n);
 }
 
-void random_buffer(uint8_t *buf, size_t len)
+void __attribute__((weak)) random_buffer(uint8_t *buf, size_t len)
 {
 	uint32_t r = 0;
 	for (size_t i = 0; i < len; i++) {