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diff --git a/src/slalib/random.f_sun4 b/src/slalib/random.f_sun4
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+      REAL FUNCTION sla_RANDOM (SEED)
+*+
+*     - - - - - - -
+*      R A N D O M
+*     - - - - - - -
+*
+*  Generate pseudo-random real number in the range 0 <= X < 1.
+*  (single precision)
+*
+*  !!! Sun 4 dependent !!!
+*
+*  Given:
+*     SEED     real     an arbitrary real number
+*
+*  Notes:
+*
+*  1)  The result is a pseudo-random REAL number in the range
+*      0 <= sla_RANDOM < 1.
+*
+*  2)  SEED is used first time through only.
+*
+*  Called:  RAND (a REAL function from the Sun Fortran Library)
+*
+*  P.T.Wallace   Starlink   14 October 1991
+*
+*  Copyright (C) 1995 Rutherford Appleton Laboratory
+*-
+
+      IMPLICIT NONE
+
+      REAL SEED
+
+      REAL RAND
+
+      REAL AS
+      INTEGER ISEED
+      LOGICAL FIRST
+      SAVE FIRST
+      DATA FIRST /.TRUE./
+
+
+
+*  If first time, turn SEED into a large, odd integer, and start the
+*  generator
+      IF (FIRST) THEN
+         AS=ABS(SEED)+1.0
+         ISEED=NINT(AS/10.0**(NINT(ALOG10(AS))-6))
+         IF (MOD(ISEED,2).EQ.0) ISEED=ISEED+1
+         FIRST=.FALSE.
+         AS=RAND(ISEED)
+      END IF
+
+*  Next pseudo-random number
+      sla_RANDOM=RAND(0)
+
+      END