diff --git a/Userland/Libraries/LibJS/Runtime/StringConstructor.cpp b/Userland/Libraries/LibJS/Runtime/StringConstructor.cpp
index d13a4f089f..2689d6f3d3 100644
--- a/Userland/Libraries/LibJS/Runtime/StringConstructor.cpp
+++ b/Userland/Libraries/LibJS/Runtime/StringConstructor.cpp
@@ -124,7 +124,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringConstructor::raw)
 // 22.1.2.1 String.fromCharCode ( ...codeUnits ), https://tc39.es/ecma262/#sec-string.fromcharcode
 JS_DEFINE_NATIVE_FUNCTION(StringConstructor::from_char_code)
 {
-    Vector<u16> string;
+    Vector<u16, 1> string;
     string.ensure_capacity(vm.argument_count());
 
     for (size_t i = 0; i < vm.argument_count(); ++i) {
diff --git a/Userland/Libraries/LibJS/Runtime/StringPrototype.cpp b/Userland/Libraries/LibJS/Runtime/StringPrototype.cpp
index 6fb4f8d613..77b6bf9003 100644
--- a/Userland/Libraries/LibJS/Runtime/StringPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/StringPrototype.cpp
@@ -483,7 +483,7 @@ static Value pad_string(GlobalObject& global_object, Utf16String string, PadPlac
     if (max_length <= string_length)
         return js_string(vm, move(string));
 
-    Utf16String fill_string(Vector<u16> { 0x20 });
+    Utf16String fill_string(Vector<u16, 1> { 0x20 });
     if (!vm.argument(1).is_undefined()) {
         fill_string = vm.argument(1).to_utf16_string(global_object);
         if (vm.exception())
diff --git a/Userland/Libraries/LibJS/Runtime/Value.cpp b/Userland/Libraries/LibJS/Runtime/Value.cpp
index e87ec1f189..406518807c 100644
--- a/Userland/Libraries/LibJS/Runtime/Value.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Value.cpp
@@ -1106,7 +1106,7 @@ Value add(GlobalObject& global_object, Value lhs, Value rhs)
             auto const& lhs_utf16_string = lhs_string.utf16_string();
             auto const& rhs_utf16_string = rhs_string.utf16_string();
 
-            Vector<u16> combined;
+            Vector<u16, 1> combined;
             combined.ensure_capacity(lhs_utf16_string.length_in_code_units() + rhs_utf16_string.length_in_code_units());
             combined.extend(lhs_utf16_string.string());
             combined.extend(rhs_utf16_string.string());