diff --git a/pam_usb/src/device.c b/pam_usb/src/device.c
index b0702b6..85f67ee 100644
--- a/pam_usb/src/device.c
+++ b/pam_usb/src/device.c
@@ -22,14 +22,15 @@
 #include "hal.h"
 #include "log.h"
 #include "otp.h"
+#include "device.h"
 
-LibHalDrive	*pusb_device_get_storage(t_pusb_options *opts, LibHalContext *ctx,
-					 const char *udi)
+static LibHalDrive	*pusb_device_get_storage(t_pusb_options *opts, LibHalContext *ctx,
+						 const char *udi)
 {
-  char		*phy_udi = NULL;
-  char		*storage_udi = NULL;
-  int		maxloop = 0;
-  LibHalDrive	*drive = NULL;
+  char			*phy_udi = NULL;
+  char			*storage_udi = NULL;
+  int			maxloop = 0;
+  LibHalDrive		*drive = NULL;
 
   log_debug("Waiting for device to come up...\n");
   while (!(phy_udi = pusb_hal_find_item(ctx,
diff --git a/pam_usb/src/device.h b/pam_usb/src/device.h
new file mode 100644
index 0000000..05b07dc
--- /dev/null
+++ b/pam_usb/src/device.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2003-2006 Andrea Luzzardi <scox@sig11.org>
+ *
+ * This file is part of the pam_usb project. pam_usb is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU General
+ * Public License version 2, as published by the Free Software Foundation.
+ *
+ * pam_usb is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef PUSB_DEVICE_H_
+# define PUSB_DEVICE_H_
+
+int pusb_device_check(t_pusb_options *opts);
+
+#endif /* !PUSB_DEVICE_H_ */
diff --git a/pam_usb/src/test.c b/pam_usb/src/test.c
index 426fe13..eb6094b 100644
--- a/pam_usb/src/test.c
+++ b/pam_usb/src/test.c
@@ -18,6 +18,7 @@
 #include <stdio.h>
 #include "conf.h"
 #include "log.h"
+#include "device.h"
 
 static void	pusb_dump_conf(t_pusb_options *opts)
 {