diff --git a/src/region_block.h b/src/region_block.h
index a1078176e1..35ee7fe2f2 100644
--- a/src/region_block.h
+++ b/src/region_block.h
@@ -30,17 +30,25 @@ class RegBlock : public Region {
  public:
   RegBlock(class LAMMPS *, int, char **);
   ~RegBlock() override;
+  void init() override;
   int inside(double, double, double) override;
   int surface_interior(double *, double) override;
   int surface_exterior(double *, double) override;
+  void shape_update() override;
 
  protected:
   double xlo, xhi, ylo, yhi, zlo, zhi;
   double corners[6][4][3];
   double face[6][3];
+  int xlostyle, xlovar, xhistyle, xhivar;
+  int ylostyle, ylovar, yhistyle, yhivar;
+  int zlostyle, zlovar, zhistyle, zhivar;
+  char *xlostr, *ylostr, *zlostr;
+  char *xhistr, *yhistr, *zhistr;
 
   double find_closest_point(int, double *, double &, double &, double &);
   int inside_face(double *, int);
+  void variable_check();
 };
 
 }    // namespace LAMMPS_NS