diff --git a/apps/kdf.c b/apps/kdf.c
index 4bbb88a5ae..5c33234b57 100644
--- a/apps/kdf.c
+++ b/apps/kdf.c
@@ -135,7 +135,7 @@ opthelp:
     if (dkm_bytes == NULL)
         goto err;
 
-    if (!EVP_KDF_derive(ctx, dkm_bytes, dkm_len)) {
+    if (!EVP_KDF_derive(ctx, dkm_bytes, dkm_len, NULL)) {
         BIO_printf(bio_err, "EVP_KDF_derive failed\n");
         goto err;
     }