diff --git a/lib/isc/random.c b/lib/isc/random.c
index f7f7c7cdbf..04fd80de08 100644
--- a/lib/isc/random.c
+++ b/lib/isc/random.c
@@ -120,6 +120,7 @@ isc_random_seed(isc_uint32_t seed) {
 	 * the OS itself is supposed to seed the RNG and it is assumed
 	 * that no explicit seeding is required.
 	 */
+	UNUSED(seed);
 #endif
 }