diff --git a/NonLinearSolver/periodicBC/pbcSupplementConstraint.h b/NonLinearSolver/periodicBC/pbcSupplementConstraint.h
index 2a5f8ea0cbe3c8916139bab5705e6d6c785a26df..38c7cbb0deca9832bd8e18e405d16ed4a1c7720e 100644
--- a/NonLinearSolver/periodicBC/pbcSupplementConstraint.h
+++ b/NonLinearSolver/periodicBC/pbcSupplementConstraint.h
@@ -110,7 +110,6 @@ class supplementConstraint : public supplementConstraintBase{
 		
   protected:
     groupOfElements* _g;
-    QuadratureBase* _integrationRule; // integration rule for approximate integrals
     fullMatrix<double>  _C, _S, _Cbc; // constraint matrix
     SVector3 _Xmean; // int_S{X} dA
 		STensor3 _XXmean; // int_S{0.5*X*X} dA