diff --git a/src/libsystemd-network/fuzz-dhcp-client.c b/src/libsystemd-network/fuzz-dhcp-client.c
index 23471f89fc..7a59faff63 100644
--- a/src/libsystemd-network/fuzz-dhcp-client.c
+++ b/src/libsystemd-network/fuzz-dhcp-client.c
@@ -6,6 +6,7 @@
 #include "fuzz.h"
 #include "network-internal.h"
 #include "sd-dhcp-client.c"
+#include "tests.h"
 #include "tmpfile-util.h"
 
 int dhcp_network_bind_raw_socket(
@@ -19,77 +20,56 @@ int dhcp_network_bind_raw_socket(
                 bool so_priority_set,
                 int so_priority) {
 
-        int fd;
-        fd = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
-        if (fd < 0)
-                return -errno;
-
-        return fd;
+        return ASSERT_OK_ERRNO(socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0));
 }
 
 int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link, const void *packet, size_t len) {
-        return len;
+        return 0;
 }
 
 int dhcp_network_bind_udp_socket(int ifindex, be32_t address, uint16_t port, int ip_service_type) {
-        int fd;
-
-        fd = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
-        if (fd < 0)
-                return -errno;
-
-        return fd;
+        return ASSERT_OK_ERRNO(socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0));
 }
 
 int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port, const void *packet, size_t len) {
-        return len;
+        return 0;
 }
 
 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
-        uint8_t mac_addr[] = {'A', 'B', 'C', '1', '2', '3'};
-        uint8_t bcast_addr[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
-        _cleanup_(sd_dhcp_client_unrefp) sd_dhcp_client *client = NULL;
-        _cleanup_(sd_event_unrefp) sd_event *e = NULL;
-        _cleanup_(sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL;
-        _cleanup_(unlink_tempfilep) char lease_file[] = "/tmp/fuzz-dhcp-client.XXXXXX";
-        _cleanup_close_ int fd = -1;
-        int res, r;
+        static const uint8_t mac_addr[] = {'A', 'B', 'C', '1', '2', '3'};
+        static const uint8_t bcast_addr[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
 
-        assert_se(setenv("SYSTEMD_NETWORK_TEST_MODE", "1", 1) >= 0);
+        ASSERT_OK_ERRNO(setenv("SYSTEMD_NETWORK_TEST_MODE", "1", /* overwrite= */ true));
 
         fuzz_setup_logging();
 
-        r = sd_dhcp_client_new(&client, false);
-        assert_se(r >= 0);
-        assert_se(client);
+        _cleanup_(sd_event_unrefp) sd_event *e = NULL;
+        ASSERT_OK(sd_event_new(&e));
+        ASSERT_NOT_NULL(e);
 
-        assert_se(sd_event_new(&e) >= 0);
+        _cleanup_(sd_dhcp_client_unrefp) sd_dhcp_client *client = NULL;
+        ASSERT_OK(sd_dhcp_client_new(&client, /* anonymize= */ false));
+        ASSERT_NOT_NULL(client);
 
-        r = sd_dhcp_client_attach_event(client, e, 0);
-        assert_se(r >= 0);
+        ASSERT_OK(sd_dhcp_client_attach_event(client, e, /* priority= */ 0));
 
-        assert_se(sd_dhcp_client_set_ifindex(client, 42) >= 0);
-        assert_se(sd_dhcp_client_set_mac(client, mac_addr, bcast_addr, ETH_ALEN, ARPHRD_ETHER) >= 0);
+        ASSERT_OK(sd_dhcp_client_set_ifindex(client, 42));
+        ASSERT_OK(sd_dhcp_client_set_mac(client, mac_addr, bcast_addr, ETH_ALEN, ARPHRD_ETHER));
 
-        res = sd_dhcp_client_start(client);
-        assert_se(IN_SET(res, 0, -EINPROGRESS));
+        ASSERT_OK(sd_dhcp_client_start(client));
         client->xid = 2;
         client->state = DHCP_STATE_SELECTING;
 
-        if (client_handle_offer_or_rapid_ack(client, (DHCPMessage*) data, size, NULL) < 0)
-                goto end;
+        if (client_handle_offer_or_rapid_ack(client, (DHCPMessage*) data, size, NULL) >= 0) {
+                _cleanup_(unlink_tempfilep) char lease_file[] = "/tmp/fuzz-dhcp-client.XXXXXX";
+                _unused_ _cleanup_close_ int fd = ASSERT_OK(mkostemp_safe(lease_file));
 
-        fd = mkostemp_safe(lease_file);
-        assert_se(fd >= 0);
+                ASSERT_OK(dhcp_lease_save(client->lease, lease_file));
 
-        r = dhcp_lease_save(client->lease, lease_file);
-        assert_se(r >= 0);
-
-        r = dhcp_lease_load(&lease, lease_file);
-        assert_se(r >= 0);
-
-end:
-        assert_se(sd_dhcp_client_stop(client) >= 0);
+                _cleanup_(sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL;
+                ASSERT_OK(dhcp_lease_load(&lease, lease_file));
+        }
 
+        ASSERT_OK(sd_dhcp_client_stop(client));
         return 0;
 }