diff --git a/configure.ac b/configure.ac
index 82e8bb7c141..081e2bc75bd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3184,7 +3184,7 @@ if test "x$openssl" = "xyes" ; then
 		]], [[
 		unsigned char buf[64];
 		memset(buf, 0, sizeof(buf));
-		exit(EVP_PKEY_new_raw_private_key(EVP_PKEY_ED25519,
+		exit(EVP_PKEY_new_raw_private_key(EVP_PKEY_ED25519, NULL,
 		    buf, sizeof(buf)) == NULL);
 		]])],
 		[