diff --git a/src/protocol.rs b/src/protocol.rs
index 6fd5eb1..ef1c8b8 100644
--- a/src/protocol.rs
+++ b/src/protocol.rs
@@ -514,7 +514,7 @@ impl From<(ByteOffset, usize)> for SourceSpan {
     fn from((start, len): (ByteOffset, usize)) -> Self {
         Self {
             offset: start.into(),
-            length: len.into(),
+            length: len,
         }
     }
 }