diff --git a/Userland/Libraries/LibJS/Lexer.cpp b/Userland/Libraries/LibJS/Lexer.cpp
index 7b58a84f32..f9c0d31de7 100644
--- a/Userland/Libraries/LibJS/Lexer.cpp
+++ b/Userland/Libraries/LibJS/Lexer.cpp
@@ -16,7 +16,7 @@
 
 namespace JS {
 
-HashMap<String, TokenType> Lexer::s_keywords;
+HashMap<FlyString, TokenType> Lexer::s_keywords;
 HashMap<String, TokenType> Lexer::s_three_char_tokens;
 HashMap<String, TokenType> Lexer::s_two_char_tokens;
 HashMap<char, TokenType> Lexer::s_single_char_tokens;
diff --git a/Userland/Libraries/LibJS/Lexer.h b/Userland/Libraries/LibJS/Lexer.h
index 1ecbac223b..ee151a5753 100644
--- a/Userland/Libraries/LibJS/Lexer.h
+++ b/Userland/Libraries/LibJS/Lexer.h
@@ -77,7 +77,7 @@ private:
 
     bool m_allow_html_comments { true };
 
-    static HashMap<String, TokenType> s_keywords;
+    static HashMap<FlyString, TokenType> s_keywords;
     static HashMap<String, TokenType> s_three_char_tokens;
     static HashMap<String, TokenType> s_two_char_tokens;
     static HashMap<char, TokenType> s_single_char_tokens;