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diff --git a/sys/pmio/pmcircle.x b/sys/pmio/pmcircle.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include <pmset.h>
+include	<plio.h>
+
+# PM_CIRCLE -- Rasterop between a circular region as source, and an existing
+# mask as destination.  It is not necessary for the center of the circle to
+# be inside the mask; if it is outside, the boundary of the circle will be
+# clipped to the boundary of the mask.  This is a 2-dim operator.  If the
+# image dimensionality is greater than two the pm_setplane procedure should
+# be called first to specify the plane to be modified.
+
+procedure pm_circle (pl, x, y, radius, rop)
+
+pointer	pl			#I mask descriptor
+int	x,y			#I center coords of circle
+int	radius			#I radius of circle
+int	rop			#I rasterop
+
+errchk	pl_getplane
+include	"pmio.com"
+
+begin
+	if (PM_MAPXY(pl) == YES) {
+	    call pl_getplane (pl, v1)
+	    v1[1] = x;  v1[2] = y
+	    call imaplv (PM_REFIM(pl), v1, v2, PM_MAXDIM)
+
+	    call pl_getplane (pl, v3)
+	    v3[1] = x + radius;  v3[2] = y
+	    call imaplv (PM_REFIM(pl), v3, v4, PM_MAXDIM)
+
+	    call pl_circle (pl, v2[1], v2[2], abs(v4[1]-v2[1]), rop)
+
+	} else
+	    call pl_circle (pl, x, y, radius, rop)
+end