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diff --git a/sys/gio/nspp/sysint/loc.x b/sys/gio/nspp/sysint/loc.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<mach.h>
+
+# LOCI -- Return the zero-indexed offset of the argument in the user address
+# space, in integer units.  In other words, if A is an integer array,
+# { loci(a[2]) - loci(a[1]) } is exactly one.
+#
+# NOTE -- The original NSPP (portlib) code called this function LOC, however,
+# the Sun-4 Fortran compiler has an intrinsic function of the same name which
+# behaves slightly differently, hence the name was changed to LOCI.
+
+int procedure loci (x)
+
+int	x
+int	xaddr
+
+begin
+	# ZLOCVA returns the address of the variable in units of XCHAR.
+
+	call zlocva (x, xaddr)
+	return (xaddr / SZ_INT)
+end