diff --git a/Sources/FoundationInternationalization/Formatting/Number/NumberFormatStyleConfiguration.swift b/Sources/FoundationInternationalization/Formatting/Number/NumberFormatStyleConfiguration.swift
index 139ecf63f..6648d0f92 100644
--- a/Sources/FoundationInternationalization/Formatting/Number/NumberFormatStyleConfiguration.swift
+++ b/Sources/FoundationInternationalization/Formatting/Number/NumberFormatStyleConfiguration.swift
@@ -502,7 +502,7 @@ extension FloatingPointRoundingRule {
 }
 
 @available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *)
-extension FloatingPointRoundingRule : Codable { }
+extension FloatingPointRoundingRule: @retroactive Codable { }
 
 @available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *)
 extension NumberFormatStyleConfiguration.RoundingIncrement: Codable {