diff --git a/Userland/Libraries/LibCpp/Lexer.cpp b/Userland/Libraries/LibCpp/Lexer.cpp
index d8c2d9b2be..d10083fa75 100644
--- a/Userland/Libraries/LibCpp/Lexer.cpp
+++ b/Userland/Libraries/LibCpp/Lexer.cpp
@@ -156,9 +156,7 @@ constexpr StringView s_known_types[] = {
     "NetworkOrdered"sv,
     "NeverDestroyed"sv,
     "NonnullOwnPtr"sv,
-    "NonnullOwnPtrVector"sv,
     "NonnullRefPtr"sv,
-    "NonnullRefPtrVector"sv,
     "Optional"sv,
     "OwnPtr"sv,
     "ReadonlyBytes"sv,