diff --git a/AK/Utf16View.h b/AK/Utf16View.h
index 19ae89c5ff3..b26d4faf1be 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;
-    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 };
 };