diff --git a/src/os/unix/ngx_socket.h b/src/os/unix/ngx_socket.h
index 67d0d41..34449d0 100644
--- a/src/os/unix/ngx_socket.h
+++ b/src/os/unix/ngx_socket.h
@@ -37,7 +37,7 @@
 int ngx_tcp_nopush(ngx_socket_t s);
 int ngx_tcp_push(ngx_socket_t s);
 
-#ifdef __linux__
+#if (NGX_LINUX)
 
 #define ngx_tcp_nopush_n   "setsockopt(TCP_CORK)"
 #define ngx_tcp_push_n     "setsockopt(!TCP_CORK)"