diff --git a/src/lib.rs b/src/lib.rs
index 12b5fe4..8450723 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -154,7 +154,7 @@ fn trans(chars: &[u8], mut index: usize) -> Result<(i64, usize), String> {
     }
 
     if !valid {
-        return Err(format!("Couldn't decode character at index {}", index - 1))
+        return Err(format!("Couldn't decode character at index {}", index - 1));
     }
 
     let coordinate_change = if (result & 1) > 0 {