diff --git a/sys/geom/eli/g_eli_crypto.c b/sys/geom/eli/g_eli_crypto.c
index e7217a1342a8..9b420972b03e 100644
--- a/sys/geom/eli/g_eli_crypto.c
+++ b/sys/geom/eli/g_eli_crypto.c
@@ -265,6 +265,7 @@ g_eli_crypto_hmac_init(struct hmac_ctx *ctx, const uint8_t *hkey,
 	/* Perform inner SHA512. */
 	SHA512_Init(&ctx->shactx);
 	SHA512_Update(&ctx->shactx, k_ipad, sizeof(k_ipad));
+	bzero(k_ipad, sizeof(k_ipad));
 }
 
 void