diff --git a/AK/StdLibExtraDetails.h b/AK/StdLibExtraDetails.h
index 51d0cb90a35..d0991b7a2a5 100644
--- a/AK/StdLibExtraDetails.h
+++ b/AK/StdLibExtraDetails.h
@@ -265,6 +265,7 @@ using MakeUnsigned = typename __MakeUnsigned<T>::Type;
 
 template<typename T>
 struct __MakeSigned {
+    using Type = void;
 };
 template<>
 struct __MakeSigned<signed char> {