diff --git a/src/lib.rs b/src/lib.rs
index 4857efc..8d94682 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -91,7 +91,7 @@ impl<'a> Parse for SyntectParser<'a> {
                 let syntax = self
                     .syntax_set
                     .find_syntax_by_token(&captures[1])
-                    .unwrap_or(self.syntax_set.find_syntax_plain_text());
+                    .unwrap_or_else(|| self.syntax_set.find_syntax_plain_text());
 
                 highlighted_html_for_string(
                     &captures[2],