diff --git a/tcp.h b/tcp.h
index c7954dd3..13006bbe 100644
--- a/tcp.h
+++ b/tcp.h
@@ -50,7 +50,7 @@ typedef struct tcpserver {
   const char *tcp_server_name;
 } tcp_server_t;
 
-#define TCP_MAX_LINE_LEN 256
+#define TCP_MAX_LINE_LEN 4000
 
 typedef struct tcp_session {
   void *tcp_dispatch_handle;