diff --git a/AK/Optional.h b/AK/Optional.h
index 766c24dd9f..1a1708beea 100644
--- a/AK/Optional.h
+++ b/AK/Optional.h
@@ -28,6 +28,7 @@
 
 #include <AK/Assertions.h>
 #include <AK/Platform.h>
+#include <AK/StdLibExtras.h>
 
 template<typename T>
 class CONSUMABLE(unknown) alignas(T) Optional {