diff --git a/stdlib/public/core/Span/Span.swift b/stdlib/public/core/Span/Span.swift
index 0160033275055..bf5e5d48dc481 100644
--- a/stdlib/public/core/Span/Span.swift
+++ b/stdlib/public/core/Span/Span.swift
@@ -506,7 +506,8 @@ extension Span where Element: BitwiseCopyable {
   }
 }
 
-@available(SwiftStdlib 6.2, *)
+@available(SwiftCompatibilitySpan 5.0, *)
+@_originallyDefinedIn(module: "Swift;CompatibilitySpan", SwiftCompatibilitySpan 6.2)
 extension Span where Element: BitwiseCopyable {
 
   public var bytes: RawSpan {