diff --git a/pgxn/neon/communicator_new.c b/pgxn/neon/communicator_new.c
index 1b31909bb1..d64e30af96 100644
--- a/pgxn/neon/communicator_new.c
+++ b/pgxn/neon/communicator_new.c
@@ -13,6 +13,8 @@
  */
 #include "postgres.h"
 
+#include <unistd.h>
+
 #include "access/xlog.h"
 #include "access/xlogdefs.h"
 #if PG_VERSION_NUM >= 150000