diff --git a/src/state.rs b/src/state.rs
index a5ce2ba..5f39a8c 100644
--- a/src/state.rs
+++ b/src/state.rs
@@ -107,10 +107,6 @@ pub struct Tree {
     pub buffer: BTreeMap<(u16, u16), u16>,
 }
 
-fn derelativize_span_coordinates(x: i16, y: i16) -> (usize, usize) {
-    return ((x + 4) as usize, (y + 4) as usize);
-}
-
 impl Tree {
     fn assert_capacity_constraint(&self) {
         if self.root.len() + self.trunk.len() > self.stack_size {