diff --git a/rust/flower-field/src/lib.rs b/rust/flower-field/src/lib.rs
index 22984c8..e526d67 100644
--- a/rust/flower-field/src/lib.rs
+++ b/rust/flower-field/src/lib.rs
@@ -21,7 +21,7 @@ impl NeighbourCounter for [&str] {
 }
 
 pub fn annotate(garden: &[&str]) -> Vec<String> {
-    if 0 == garden.len() {
+    if garden.is_empty() {
         return vec![];
     }
     (0..garden.len())