diff --git a/src/backend/libpq/pqcomprim.c b/src/backend/libpq/pqcomprim.c
index 0dd46d9205a..96acff11963 100644
--- a/src/backend/libpq/pqcomprim.c
+++ b/src/backend/libpq/pqcomprim.c
@@ -1,5 +1,6 @@
 #include <stdlib.h>
 #include <stdio.h>
+#include <sys/types.h>
 #include <netinet/in.h>
 
 #include "postgres.h"