diff --git a/stdlib/public/Cxx/std/String.swift b/stdlib/public/Cxx/std/String.swift
index 77f093e0d3d08..efef887eeee8e 100644
--- a/stdlib/public/Cxx/std/String.swift
+++ b/stdlib/public/Cxx/std/String.swift
@@ -534,7 +534,7 @@ extension String {
       unsafe String(decoding: $0, as: UTF32.self)
     }
 #endif
-    withExtendedLifetime(cxxWStringView) {}
+    unsafe withExtendedLifetime(cxxWStringView) {}
   }
 }