diff --git a/devel/py-grpcio/files/patch-third__party_boringssl-with-bazel_include_openssl_base.h b/devel/py-grpcio/files/patch-third__party_boringssl-with-bazel_include_openssl_base.h
new file mode 100644
index 000000000000..2e6e3dcb3cb3
--- /dev/null
+++ b/devel/py-grpcio/files/patch-third__party_boringssl-with-bazel_include_openssl_base.h
@@ -0,0 +1,12 @@
+--- third_party/boringssl-with-bazel/include/openssl/base.h.orig	2026-06-05 22:11:18 UTC
++++ third_party/boringssl-with-bazel/include/openssl/base.h
+@@ -396,9 +396,6 @@ typedef void *OPENSSL_BLOCK;
+ // MSVC doesn't set __cplusplus to 201103 to indicate C++11 support (see
+ // https://connect.microsoft.com/VisualStudio/feedback/details/763051/a-value-of-predefined-macro-cplusplus-is-still-199711l)
+ // so MSVC is just assumed to support C++11.
+-#if !defined(BORINGSSL_NO_CXX) && __cplusplus < 201103L && !defined(_MSC_VER)
+-#define BORINGSSL_NO_CXX
+-#endif
+ 
+ #if !defined(BORINGSSL_NO_CXX)
+