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diff --git a/sys/mwcs/mwsdefwcs.x b/sys/mwcs/mwsdefwcs.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<mwset.h>
+include	"mwcs.h"
+
+# MW_SDEFWCS -- Set the default WCS.  This is the WCS indicated by the user
+# environment variable "setwcs", if defined and the named WCS exists, else
+# the first world system is used, else the physical system is used.
+
+procedure mw_sdefwcs (mw)
+
+pointer	mw			#I pointer to MWCS descriptor
+
+pointer	sp, defwcs
+int	envfind()
+
+begin
+	call smark (sp)
+	call salloc (defwcs, SZ_FNAME, TY_CHAR)
+
+	MI_WCS(mw) = NULL
+
+	# Set the default WCS defined in the user environment, if defined
+	# and the named WCS exists in this MWCS.
+
+	if (envfind ("defwcs", Memc[defwcs], SZ_FNAME) > 0)
+	    iferr (call mw_ssystem (mw, Memc[defwcs]))
+		;
+
+	# Otherwise, the default WCS is the first world system, if any,
+	# else it is the physical system.  The first world system is WCS 3
+	# as the physical and logical systems are systems 1 and 2 and are
+	# always defined in any MWCS.
+
+	if (MI_WCS(mw) == NULL) {
+	    if (MI_NWCS(mw) >= 3)
+		MI_WCS(mw) = MI_WCSP(mw,3)
+	    else
+		call mw_ssystem (mw, "physical")
+	}
+
+	call sfree (sp)
+end