diff --git a/Userland/Libraries/LibWeb/HTML/Parser/HTMLTokenizer.cpp b/Userland/Libraries/LibWeb/HTML/Parser/HTMLTokenizer.cpp
index 37be0a014d..6fad045f43 100644
--- a/Userland/Libraries/LibWeb/HTML/Parser/HTMLTokenizer.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Parser/HTMLTokenizer.cpp
@@ -231,7 +231,7 @@ Optional<HTMLToken> HTMLTokenizer::next_token()
 {
     {
         auto last_position = m_source_positions.last();
-        m_source_positions.clear();
+        m_source_positions.clear_with_capacity();
         m_source_positions.append(move(last_position));
     }
 _StartOfFunction: