diff --git a/internal/platform/implementation/windows/generated/base-no-coroutines.patch b/internal/platform/implementation/windows/generated/base-no-coroutines.patch
index 60e5fe90..dd98c390 100644
--- a/internal/platform/implementation/windows/generated/base-no-coroutines.patch
+++ b/internal/platform/implementation/windows/generated/base-no-coroutines.patch
@@ -2,7 +2,7 @@
 --- third_party/nearby/internal/platform/implementation/windows/generated/winrt/base-no-coroutines.h	2022-12-07 15:28:53.000000000 -0500
 ***************
 *** 35,40 ****
---- 35,66 ----
+--- 35,67 ----
   #include <format>
   #endif
   
@@ -10,6 +10,7 @@
 + // If the C++ standard is cxx17, coroutines are not available in libc++.
 + // To compile WinRT without coroutines, define some placeholder types.
 + // These placeholders should not be used. If they are used, they should fail.
++ namespace std::experimental {
 + template <typename T = void>
 + struct coroutine_handle {
 +   coroutine_handle() { throw std::logic_error("Not implemented."); }
diff --git a/internal/platform/implementation/windows/generated/winrt/base.h b/internal/platform/implementation/windows/generated/winrt/base.h
index 8b75fbbb..0e4468f1 100644
--- a/internal/platform/implementation/windows/generated/winrt/base.h
+++ b/internal/platform/implementation/windows/generated/winrt/base.h
@@ -39,6 +39,7 @@
 // If the C++ standard is cxx17, coroutines are not available in libc++.
 // To compile WinRT without coroutines, define some placeholder types.
 // These placeholders should not be used. If they are used, they should fail.
+namespace std::experimental {
 template <typename T = void>
 struct coroutine_handle {
   coroutine_handle() { throw std::logic_error("Not implemented."); }