diff --git a/lib/calib.c b/lib/calib.c
index 0677c63..ee823bc 100644
--- a/lib/calib.c
+++ b/lib/calib.c
@@ -27,6 +27,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <sys/stat.h>
 #include "libinternal.h"
 
 static int set_calibration( comedi_t *dev, const comedi_calibration_t *parsed_file,