diff --git a/sys/libkern/arc4random.c b/sys/libkern/arc4random.c
index 3a3227cd211f..4fcd74d814ec 100644
--- a/sys/libkern/arc4random.c
+++ b/sys/libkern/arc4random.c
@@ -69,6 +69,7 @@ arc4_randomstir (void)
 		arc4_j = (arc4_j + arc4_sbox[n] + key[n]) % 256;
 		arc4_swap(&arc4_sbox[n], &arc4_sbox[arc4_j]);
 	}
+	arc4_i = arc4_j = 0;
 
 	/* Reset for next reseed cycle. */
 	arc4_t_reseed = tv_now.tv_sec + ARC4_RESEED_SECONDS;