diff --git a/os/connection.c b/os/connection.c
index a3c8f2a99..8d4b66061 100644
--- a/os/connection.c
+++ b/os/connection.c
@@ -87,16 +87,10 @@ SOFTWARE.
 #if defined(TCPCONN)
 #include <netinet/in.h>
 #include <arpa/inet.h>
-#ifdef apollo
-#ifndef NO_TCP_H
-#include <netinet/tcp.h>
-#endif
-#else
 #ifdef CSRG_BASED
 #include <sys/param.h>
 #endif
 #include <netinet/tcp.h>
-#endif
 #include <arpa/inet.h>
 #endif