s/change_/mutable_/g
diff --git a/frc971/control_loops/shooter/shooter.h b/frc971/control_loops/shooter/shooter.h
index 7816c8e..71c1fa4 100755
--- a/frc971/control_loops/shooter/shooter.h
+++ b/frc971/control_loops/shooter/shooter.h
@@ -74,14 +74,14 @@
   double goal_position() const { return R(0) + kPositionOffset; }
   double goal_velocity() const { return R(1); }
   void InitializeState(double position) {
-    change_X_hat(0) = position - kPositionOffset;
+    mutable_X_hat(0) = position - kPositionOffset;
   }
 
   void SetGoalPosition(double desired_position, double desired_velocity) {
     LOG(DEBUG, "Goal position: %f Goal velocity: %f\n", desired_position,
         desired_velocity);
 
-    change_R() << desired_position - kPositionOffset, desired_velocity,
+    mutable_R() << desired_position - kPositionOffset, desired_velocity,
         (-A(1, 0) / A(1, 2) * (desired_position - kPositionOffset) -
          A(1, 1) / A(1, 2) * desired_velocity);
   }