diff --git a/Userland/Libraries/LibJS/Runtime/PropertyKey.h b/Userland/Libraries/LibJS/Runtime/PropertyKey.h
index 24319b65581..dc439a43347 100644
--- a/Userland/Libraries/LibJS/Runtime/PropertyKey.h
+++ b/Userland/Libraries/LibJS/Runtime/PropertyKey.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include <AK/DeprecatedFlyString.h>
+#include <AK/FlyString.h>
 #include <LibJS/Heap/Handle.h>
 #include <LibJS/Runtime/Completion.h>
 #include <LibJS/Runtime/StringOrSymbol.h>
@@ -71,6 +72,12 @@ public:
     {
     }
 
+    PropertyKey(FlyString const& string)
+        : m_type(Type::String)
+        , m_string(string.to_deprecated_fly_string())
+    {
+    }
+
     PropertyKey(DeprecatedFlyString string, StringMayBeNumber string_may_be_number = StringMayBeNumber::Yes)
         : m_string_may_be_number(string_may_be_number == StringMayBeNumber::Yes)
         , m_type(Type::String)