diff --git a/lib/linebuffer.c b/lib/linebuffer.c
index d129d307d..cb0b6ba00 100644
--- a/lib/linebuffer.c
+++ b/lib/linebuffer.c
@@ -22,6 +22,7 @@
 #endif
 
 #include <stdio.h>
+#include <sys/types.h>
 #include "linebuffer.h"
 
 char *xmalloc ();