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diff --git a/sys/vops/ak/achtdx.x b/sys/vops/ak/achtdx.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ACHTxy -- Change datatype of vector from "x" to "y" (doubly generic).
+# The operation is performed in such a way that the output vector can be
+# the same as the input vector without overwriting data.
+
+procedure achtdx (a, b, npix)
+
+double	a[ARB]
+complex	b[ARB]
+int	npix
+int	i
+
+begin
+		do i = 1, npix
+			b[i] = complex(real(a[i]),0.0)
+end