diff --git a/Userland/Libraries/LibWeb/CSS/Parser/Parser.h b/Userland/Libraries/LibWeb/CSS/Parser/Parser.h
index f40976655f..1d2225f601 100644
--- a/Userland/Libraries/LibWeb/CSS/Parser/Parser.h
+++ b/Userland/Libraries/LibWeb/CSS/Parser/Parser.h
@@ -57,6 +57,8 @@ public:
     explicit TokenStream(Vector<T> const&);
     ~TokenStream();
 
+    TokenStream(TokenStream<T> const&) = delete;
+
     bool has_next_token();
     T const& next_token();
     T const& peek_token(int offset = 0);