diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c
index c530e6c222..6bc96a47e7 100644
--- a/src/libsystemd-network/sd-dhcp-client.c
+++ b/src/libsystemd-network/sd-dhcp-client.c
@@ -1476,7 +1476,7 @@ static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata)
 }
 
 static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) {
-        sd_dhcp_client *client = userdata;
+        sd_dhcp_client *client = ASSERT_PTR(userdata);
         DHCP_CLIENT_DONT_DESTROY(client);
         int r;