diff --git a/libknet/tests/api_knet_handle_pmtud_setfreq.c b/libknet/tests/api_knet_handle_pmtud_setfreq.c
index 5645eb9f..eadba5e4 100644
--- a/libknet/tests/api_knet_handle_pmtud_setfreq.c
+++ b/libknet/tests/api_knet_handle_pmtud_setfreq.c
@@ -1,62 +1,62 @@
 /*
  * Copyright (C) 2016-2025 Red Hat, Inc.  All rights reserved.
  *
  * Authors: Fabio M. Di Nitto <fabbione@kronosnet.org>
  *
  * This software licensed under GPL-2.0+
  */
 
 #include "config.h"
 
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
 #include "libknet.h"
 
 #include "internals.h"
 #include "test-common.h"
 
 static void test(void)
 {
 	knet_handle_t knet_h1, knet_h[2];
 	int res;
 	int logfds[2];
 
 	printf("Test knet_handle_pmtud_setfreq incorrect knet_h\n");
 
 	if ((!knet_handle_pmtud_setfreq(NULL, 1)) || (errno != EINVAL)) {
 		printf("knet_handle_pmtud_setfreq accepted invalid knet_h or returned incorrect error: %s\n", strerror(errno));
 		exit(FAIL);
 	}
 
 	setup_logpipes(logfds);
 
 	knet_h1 = knet_handle_start(logfds, KNET_LOG_DEBUG, knet_h);
 
 	flush_logs(logfds[0], stdout);
 
 	printf("Test knet_handle_pmtud_setfreq with 0 (incorrect)\n");
-	FAIL_ON_SUCCESS(knet_handle_pmtud_setfreq(NULL, 0), EINVAL);
+	FAIL_ON_SUCCESS(knet_handle_pmtud_setfreq(knet_h1, 0), EINVAL);
 
 	printf("Test knet_handle_pmtud_setfreq with 86401 (incorrect)\n");
-	FAIL_ON_SUCCESS(knet_handle_pmtud_setfreq(NULL, 86401), EINVAL);
+	FAIL_ON_SUCCESS(knet_handle_pmtud_setfreq(knet_h1, 86401), EINVAL);
 
 	printf("Test knet_handle_pmtud_setfreq with 1 (correct)\n");
 	FAIL_ON_ERR(knet_handle_pmtud_setfreq(knet_h1, 1));
 
 	if (knet_h1->pmtud_interval != 1) {
 		printf("knet_handle_pmtud_setfreq failed to set the value\n");
 		CLEAN_EXIT(FAIL);
 	}
 	CLEAN_EXIT(CONTINUE);
 }
 
 int main(int argc, char *argv[])
 {
 	test();
 
 	return PASS;
 }