diff --git a/drivers/usb/mon/mon_text.c b/drivers/usb/mon/mon_text.c
index 16bfb61..31c1188 100644
--- a/drivers/usb/mon/mon_text.c
+++ b/drivers/usb/mon/mon_text.c
@@ -180,7 +180,7 @@
 	unsigned int stamp;
 
 	do_gettimeofday(&tval);
-	stamp = tval.tv_sec & 0xFFFF;	/* 2^32 = 4294967296. Limit to 4096s. */
+	stamp = tval.tv_sec & 0xFFF;	/* 2^32 = 4294967296. Limit to 4096s. */
 	stamp = stamp * 1000000 + tval.tv_usec;
 	return stamp;
 }