diff --git a/src/core/socket.c b/src/core/socket.c
index 08efc3754c..aa65c5b7a0 100644
--- a/src/core/socket.c
+++ b/src/core/socket.c
@@ -839,7 +839,7 @@ static void socket_apply_socket_options(Socket *s, int fd) {
 
         if (s->keep_alive_cnt) {
                 int value = s->keep_alive_cnt;
-                if (setsockopt(fd, SOL_SOCKET, TCP_KEEPCNT, &value, sizeof(value)) < 0)
+                if (setsockopt(fd, SOL_TCP, TCP_KEEPCNT, &value, sizeof(value)) < 0)
                         log_unit_warning_errno(UNIT(s), errno, "TCP_KEEPCNT failed: %m");
         }