diff --git a/src/position.rs b/src/position.rs
index 1e4758c..76ade93 100644
--- a/src/position.rs
+++ b/src/position.rs
@@ -8,6 +8,8 @@ use cached::proc_macro::cached;
 use geocoding::{Forward, Openstreetmap, Point};
 use rocket::tokio;
 
+use std::f64::consts::PI;
+
 /// A (geocoded) position.
 ///
 /// This is used for measuring and communication positions directly on the Earth as latitude and