diff --git a/src/preserve_fds.c b/src/preserve_fds.c
index cbdd5e8e5..60067c58b 100644
--- a/src/preserve_fds.c
+++ b/src/preserve_fds.c
@@ -16,6 +16,8 @@
 
 #include <config.h>
 
+#include <sys/types.h>
+
 #include <stdio.h>
 #include <stdlib.h>
 #ifdef HAVE_STRING_H