diff --git a/frc971/shooter_interpolation/interpolation.h b/frc971/shooter_interpolation/interpolation.h
index c66b6cc..933c95e 100644
--- a/frc971/shooter_interpolation/interpolation.h
+++ b/frc971/shooter_interpolation/interpolation.h
@@ -21,7 +21,7 @@
 
   // Uses the interpolation table to calculate the optimal shooter angle and
   // power for a shot
-  ShotParams GetShooterData(double distance);
+  ShotParams GetShooterData(double distance) const;
 
  private:
   // Contains the list of angle entries in the interpolation table