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diff --git a/src/slalib/aoppat.f b/src/slalib/aoppat.f
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+      SUBROUTINE sla_AOPPAT (DATE, AOPRMS)
+*+
+*     - - - - - - -
+*      A O P P A T
+*     - - - - - - -
+*
+*  Recompute the sidereal time in the apparent to observed place
+*  star-independent parameter block.
+*
+*  Given:
+*     DATE   d      UTC date/time (modified Julian Date, JD-2400000.5)
+*                   (see AOPPA source for comments on leap seconds)
+*
+*     AOPRMS d(14)  star-independent apparent-to-observed parameters
+*
+*       (1-12)   not required
+*       (13)     longitude + eqn of equinoxes + sidereal DUT
+*       (14)     not required
+*
+*  Returned:
+*     AOPRMS d(14)  star-independent apparent-to-observed parameters:
+*
+*       (1-13)   not changed
+*       (14)     local apparent sidereal time (radians)
+*
+*  For more information, see sla_AOPPA.
+*
+*  Called:  sla_GMST
+*
+*  P.T.Wallace   Starlink   1 July 1993
+*
+*  Copyright (C) 1995 Rutherford Appleton Laboratory
+*-
+
+      IMPLICIT NONE
+
+      DOUBLE PRECISION DATE,AOPRMS(14)
+
+      DOUBLE PRECISION sla_GMST
+
+
+
+      AOPRMS(14) = sla_GMST(DATE)+AOPRMS(13)
+
+      END