diff --git a/frc971/shooter_interpolation/interpolation.cc b/frc971/shooter_interpolation/interpolation.cc
index f558acd..4eba448 100644
--- a/frc971/shooter_interpolation/interpolation.cc
+++ b/frc971/shooter_interpolation/interpolation.cc
@@ -30,7 +30,7 @@
   });
 }
 
-ShotParams InterpolationTable::GetShooterData(double distance) {
+ShotParams InterpolationTable::GetShooterData(double distance) const {
   // Points to to the smallest item such that it->first >= dist, or end() if no
   // such item exists.
   auto it = ::std::lower_bound(table_.begin(), table_.end(), distance,