diff --git a/minijinja/src/compiler/lexer.rs b/minijinja/src/compiler/lexer.rs
index 602a684c..24bb236f 100644
--- a/minijinja/src/compiler/lexer.rs
+++ b/minijinja/src/compiler/lexer.rs
@@ -87,7 +87,7 @@ fn find_start_marker_memchr(a: &str) -> Option<(usize, StartMarker, usize, White
     let bytes = a.as_bytes();
     let mut offset = 0;
     loop {
-        let idx = memchr(&bytes[offset..], b'{')?;
+        let idx = some!(memchr(&bytes[offset..], b'{'));
         let marker = match bytes.get(offset + idx + 1).copied() {
             Some(b'{') => StartMarker::Variable,
             Some(b'%') => StartMarker::Block,
@@ -527,7 +527,7 @@ impl<'s> Tokenizer<'s> {
         let s = self.advance(str_len + 2);
         Ok(if has_escapes {
             (
-                Token::String(unescape(&s[1..s.len() - 1])?),
+                Token::String(ok!(unescape(&s[1..s.len() - 1]))),
                 self.span(old_loc),
             )
         } else {