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diff --git a/src/slalib/ranorm.f b/src/slalib/ranorm.f
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+      REAL FUNCTION sla_RANORM (ANGLE)
+*+
+*     - - - - - - -
+*      R A N O R M
+*     - - - - - - -
+*
+*  Normalize angle into range 0-2 pi  (single precision)
+*
+*  Given:
+*     ANGLE     dp      the angle in radians
+*
+*  The result is ANGLE expressed in the range 0-2 pi (single
+*  precision).
+*
+*  P.T.Wallace   Starlink   23 November 1995
+*
+*  Copyright (C) 1995 Rutherford Appleton Laboratory
+*-
+
+      IMPLICIT NONE
+
+      REAL ANGLE
+
+      REAL A2PI
+      PARAMETER (A2PI=6.283185307179586476925287)
+
+
+      sla_RANORM=MOD(ANGLE,A2PI)
+      IF (sla_RANORM.LT.0.0) sla_RANORM=sla_RANORM+A2PI
+
+      END