diff --git a/src/lib.rs b/src/lib.rs
index d762b95..4857efc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -88,7 +88,11 @@ impl<'a> Parse for SyntectParser<'a> {
         let file = String::from_utf8_lossy(src).to_string();
         let result = CODE_BLOCK_RE
             .replace_all(file.as_str(), |captures: &Captures| {
-                let syntax = self.syntax_set.find_syntax_by_token(&captures[1]).unwrap();
+                let syntax = self
+                    .syntax_set
+                    .find_syntax_by_token(&captures[1])
+                    .unwrap_or(self.syntax_set.find_syntax_plain_text());
+
                 highlighted_html_for_string(
                     &captures[2],
                     &self.syntax_set,