diff --git a/src/tokenizer/ascii_folding_filter.rs b/src/tokenizer/ascii_folding_filter.rs
index 3e800971b7..56b4dfac77 100644
--- a/src/tokenizer/ascii_folding_filter.rs
+++ b/src/tokenizer/ascii_folding_filter.rs
@@ -29,7 +29,7 @@ impl<'a> TokenStream for AsciiFoldingFilterTokenStream<'a> {
         }
         if !self.token_mut().text.is_ascii() {
             // ignore its already ascii
-            to_ascii(&mut self.tail.token_mut().text, &mut self.buffer);
+            to_ascii(&self.tail.token().text, &mut self.buffer);
             mem::swap(&mut self.tail.token_mut().text, &mut self.buffer);
         }
         true
diff --git a/src/tokenizer/lower_caser.rs b/src/tokenizer/lower_caser.rs
index 2136b0063f..c6bc7b225d 100644
--- a/src/tokenizer/lower_caser.rs
+++ b/src/tokenizer/lower_caser.rs
@@ -40,7 +40,7 @@ impl<'a> TokenStream for LowerCaserTokenStream<'a> {
             // fast track for ascii.
             self.token_mut().text.make_ascii_lowercase();
         } else {
-            to_lowercase_unicode(&mut self.tail.token_mut().text, &mut self.buffer);
+            to_lowercase_unicode(&self.tail.token().text, &mut self.buffer);
             mem::swap(&mut self.tail.token_mut().text, &mut self.buffer);
         }
         true