diff --git a/appl/ftp/ftpd/popen.c b/appl/ftp/ftpd/popen.c
index 49df82c08..add726125 100644
--- a/appl/ftp/ftpd/popen.c
+++ b/appl/ftp/ftpd/popen.c
@@ -51,6 +51,9 @@ static char rcsid[] = "$NetBSD: popen.c,v 1.5 1995/04/11 02:45:00 cgd Exp $";
 
 #include <sys/types.h>
 #include <sys/time.h>
+#ifdef HAVE_SYS_RESOURCE_H
+#include <sys/resource.h>
+#endif
 #include <sys/wait.h>
 
 #include <errno.h>