diff --git a/uniquepoints.c b/uniquepoints.c
index ef6046ad..c82817a8 100644
--- a/uniquepoints.c
+++ b/uniquepoints.c
@@ -283,7 +283,6 @@ int finduniquepoints(const struct grdecl *g,
     int     len    = 0;
     double  *zout  = zlist;
     int     pos    = 0;
-    double *coord = (double*)g->coord;
     double *pt;
     const double *z[4];
     const int *a[4];
@@ -291,6 +290,8 @@ int finduniquepoints(const struct grdecl *g,
     int pix, cix;
     int zix;
 
+    const double *coord = g->coord;
+
     d1[0] = 2*g->dims[0];
     d1[1] = 2*g->dims[1];
     d1[2] = 2*g->dims[2];