diff --git a/src/protocol/parser/pass_rewriting.rs b/src/protocol/parser/pass_rewriting.rs
index ccbfca20870bad54d815d7c84983fd2c025bb478..a9f869d38c905cdbbe880ecdbd4bc522a8bf5b82 100644
--- a/src/protocol/parser/pass_rewriting.rs
+++ b/src/protocol/parser/pass_rewriting.rs
@@ -267,7 +267,7 @@ impl Visitor for PassRewriting {
 
         // Now we transform each of the select block case's guard and code into
         // a chained if-else statement.
-        let mut relative_pos = transformed_stmts.len() as i32;
+        let relative_pos = transformed_stmts.len() as i32;
         if total_num_cases > 0 {
             let (if_stmt_id, end_if_stmt_id, scope_id) = transform_select_case_code(ctx, self.current_procedure_id, id, 0, select_variable_id, select_variable_type);
             link_existing_child_to_new_parent_scope(ctx, &mut self.scope_buffer, outer_scope_id, scope_id, relative_pos);