diff --git a/crates/ra_editor/src/extend_selection.rs b/crates/ra_editor/src/extend_selection.rs
index a6cb1acf5f..6977900e68 100644
--- a/crates/ra_editor/src/extend_selection.rs
+++ b/crates/ra_editor/src/extend_selection.rs
@@ -47,11 +47,11 @@ fn extend_single_word_in_comment(leaf: SyntaxNodeRef, offset: TextUnit) -> Optio
     let cursor_position: u32 = (offset - leaf.range().start()).into();
 
     let (before, after) = text.split_at(cursor_position as usize);
-    let start_idx = before.rfind(char::is_whitespace)?;
-    let end_idx = after.find(char::is_whitespace)?;
+    let start_idx = before.rfind(char::is_whitespace)? as u32;
+    let end_idx = after.find(char::is_whitespace)? as u32;
 
-    let from : TextUnit = (start_idx as u32 + 1).into();
-    let to : TextUnit = (cursor_position + (end_idx as u32)).into();
+    let from : TextUnit = (start_idx + 1).into();
+    let to : TextUnit = (cursor_position + end_idx).into();
 
     Some(TextRange::from_to(from, to))
 }