diff --git a/server/src/features/completion.rs b/server/src/features/completion.rs
index 4570ac0d..224d1499 100644
--- a/server/src/features/completion.rs
+++ b/server/src/features/completion.rs
@@ -43,7 +43,7 @@ impl CompletionFeature {
         character: u32
     ) -> Option<CompletionResponse> {
         let offset = file_info.borrow().position_to_offset(line, character);
-        let mut file_info =  file_info.borrow_mut();
+        let file_info =  file_info.borrow();
         let file_info_ast = file_info.file_info_ast.borrow();
         let ast = file_info_ast.ast.as_ref().unwrap();
         complete_vec_stmt(ast, session, file_symbol, offset)