diff --git a/lib/isc/random.c b/lib/isc/random.c
index 152f0cc16a..79fbc7c7aa 100644
--- a/lib/isc/random.c
+++ b/lib/isc/random.c
@@ -87,7 +87,7 @@ isc_random_initialize(void) {
 #else
 	isc_entropy_get(useed, sizeof(useed));
 #endif
-	memcpy(seed, useed, sizeof(seed));
+	memmove(seed, useed, sizeof(seed));
 }
 
 uint8_t