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diff --git a/pkg/system/mtclean.x b/pkg/system/mtclean.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# MTCLEAN -- Clean the magtape .lok file area, i.e., delete any old .lok files.
+# These files no longer serve any device locking purpose, rather, they are
+# used by the magtape system to store knowledge of the tape position when
+# the drive is not being accessed.  The mtclean task is called during CL
+# startup to delete any old .lok files to keep these from being erroneously
+# used to indicate the tape position.  In normal use the .lok files are
+# created when a tape is allocated and deleted when the tape is deallocated,
+# but the files can be left behind if the CL is killed without doing a
+# deallocate.
+
+procedure t_mtclean()
+
+int	out
+bool	clgetb()
+int	clgeti(), btoi()
+
+begin
+	out = NULL
+	if (clgetb ("verbose"))
+	    out = STDOUT
+
+	call mtclean (btoi(clgetb("all")), clgeti("stale"), out)
+end