diff --git a/AK/HashTable.h b/AK/HashTable.h
index a30e7d1c10b..126e035db6f 100644
--- a/AK/HashTable.h
+++ b/AK/HashTable.h
@@ -789,7 +789,7 @@ private:
 
     BucketType* m_buckets { nullptr };
 
-    [[no_unique_address]] CollectionDataType m_collection_data;
+    NO_UNIQUE_ADDRESS CollectionDataType m_collection_data;
     size_t m_size { 0 };
     size_t m_capacity { 0 };
 };
diff --git a/AK/IntrusiveList.h b/AK/IntrusiveList.h
index 2617f55ccd7..9e4e690e8c7 100644
--- a/AK/IntrusiveList.h
+++ b/AK/IntrusiveList.h
@@ -169,7 +169,7 @@ private:
     IntrusiveListStorage<T, Container>* m_storage = nullptr;
     SubstitutedIntrusiveListNode<T, Container>* m_next = nullptr;
     SubstitutedIntrusiveListNode<T, Container>* m_prev = nullptr;
-    [[no_unique_address]] SelfReferenceIfNeeded<Container, IsRaw> m_self;
+    NO_UNIQUE_ADDRESS SelfReferenceIfNeeded<Container, IsRaw> m_self;
 };
 
 template<class T, typename Container, SubstitutedIntrusiveListNode<T, Container> T::* member>
diff --git a/AK/IntrusiveRedBlackTree.h b/AK/IntrusiveRedBlackTree.h
index a5585de662c..28c01e8ffb5 100644
--- a/AK/IntrusiveRedBlackTree.h
+++ b/AK/IntrusiveRedBlackTree.h
@@ -212,7 +212,7 @@ private:
 #endif
 
     bool m_in_tree { false };
-    [[no_unique_address]] SelfReferenceIfNeeded<Container, IsRaw> m_self;
+    NO_UNIQUE_ADDRESS SelfReferenceIfNeeded<Container, IsRaw> m_self;
 };
 
 // Specialise IntrusiveRedBlackTree for NonnullRefPtr
diff --git a/AK/Utf16View.h b/AK/Utf16View.h
index b26d4faf1be..e993bf40521 100644
--- a/AK/Utf16View.h
+++ b/AK/Utf16View.h
@@ -138,7 +138,7 @@ private:
     size_t calculate_length_in_code_points() const;
 
     ReadonlySpan<u16> m_code_units;
-    [[no_unique_address]] mutable Optional<size_t> m_length_in_code_points;
+    NO_UNIQUE_ADDRESS mutable Optional<size_t> m_length_in_code_points;
     Endianness m_endianness { Endianness::Host };
 };