diff --git a/src/day11/mod.rs b/src/day11/mod.rs
index 0c7823a..4b7dda5 100644
--- a/src/day11/mod.rs
+++ b/src/day11/mod.rs
@@ -44,7 +44,7 @@ fn extract(symbols: Vec<Vec<String>>) -> Vec<Galaxy> {
     galaxies
 }
 
-fn expand(galaxies: &mut Vec<Galaxy>) {}
+fn expand(_galaxies: &mut Vec<Galaxy>) {}
 
 struct Galaxy {
     x: usize,