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diff --git a/src/slalib/vdv.f b/src/slalib/vdv.f
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+      REAL FUNCTION sla_VDV (VA, VB)
+*+
+*     - - - -
+*      V D V
+*     - - - -
+*
+*  Scalar product of two 3-vectors  (single precision)
+*
+*  Given:
+*      VA      real(3)     first vector
+*      VB      real(3)     second vector
+*
+*  The result is the scalar product VA.VB (single precision)
+*
+*  P.T.Wallace   Starlink   November 1984
+*
+*  Copyright (C) 1995 Rutherford Appleton Laboratory
+*-
+
+      IMPLICIT NONE
+
+      REAL VA(3),VB(3)
+
+
+      sla_VDV=VA(1)*VB(1)+VA(2)*VB(2)+VA(3)*VB(3)
+
+      END