diff --git a/Solver/linearSystemPETSc.h b/Solver/linearSystemPETSc.h
index e1b826c7b6e7a8571e74a5b3dd7d392b5e2d7afa..2b1790141ddcd80680b10d64ff255609bbd27d68 100644
--- a/Solver/linearSystemPETSc.h
+++ b/Solver/linearSystemPETSc.h
@@ -49,7 +49,6 @@
 template <class scalar>
 class linearSystemPETSc : public linearSystem<scalar> {
  private:
-  int _e;
   bool _isAllocated;
   Mat _a;
   Vec _b, _x;