diff --git a/net/tcp/tcp_wrbuffer.c b/net/tcp/tcp_wrbuffer.c
index 9cd8e798b3..c203285ce7 100644
--- a/net/tcp/tcp_wrbuffer.c
+++ b/net/tcp/tcp_wrbuffer.c
@@ -51,6 +51,7 @@
 #include <queue.h>
 #include <string.h>
 #include <assert.h>
+#include <errno.h>
 #include <debug.h>
 
 #include <nuttx/semaphore.h>