diff --git a/src/os/unix/ngx_freebsd_config.h b/src/os/unix/ngx_freebsd_config.h
index c641108b705..81534297454 100644
--- a/src/os/unix/ngx_freebsd_config.h
+++ b/src/os/unix/ngx_freebsd_config.h
@@ -103,7 +103,7 @@ typedef struct aiocb  ngx_aiocb_t;
 #define NGX_LISTEN_BACKLOG        -1
 
 
-#ifdef __DragonFly__
+#if (defined __DragonFly__ && __DragonFly_version < 500702)
 #define NGX_KEEPALIVE_FACTOR      1000
 #endif