diff --git a/hpb_generator/tests/BUILD b/hpb_generator/tests/BUILD
index f6a93b1d80..6f463229a0 100644
--- a/hpb_generator/tests/BUILD
+++ b/hpb_generator/tests/BUILD
@@ -154,8 +154,8 @@
 #         "@com_google_googletest//:gtest", "@com_google_googletest//:gtest_main",
 #         "@com_google_absl//absl/status:statusor",
 #         "@com_google_absl//absl/strings",
+#         "//hpb:requires",
 #         "//protos",
-#         "//protos:requires",
 #         "//upb:mem",
 #         "//protos:repeated_field",
 #     ],
diff --git a/hpb_generator/tests/test_generated.cc b/hpb_generator/tests/test_generated.cc
index 40636c2ee2..e2f56b8093 100644
--- a/hpb_generator/tests/test_generated.cc
+++ b/hpb_generator/tests/test_generated.cc
@@ -21,10 +21,10 @@
 #include "google/protobuf/compiler/hpb/tests/child_model.upb.proto.h"
 #include "google/protobuf/compiler/hpb/tests/no_package.upb.proto.h"
 #include "google/protobuf/compiler/hpb/tests/test_model.upb.proto.h"
+#include "google/protobuf/hpb/requires.h"
 #include "protos/protos.h"
 #include "protos/repeated_field.h"
 #include "protos/repeated_field_iterator.h"
-#include "protos/requires.h"
 #include "upb/mem/arena.h"
 #include "upb/mem/arena.hpp"
 
diff --git a/protos/BUILD b/protos/BUILD
index 0aaeca52b8..7d646b1bfc 100644
--- a/protos/BUILD
+++ b/protos/BUILD
@@ -96,9 +96,4 @@
 #     visibility = ["//visibility:public"],
 # )
 #
-# cc_library(
-#     name = "requires",
-#     hdrs = ["requires.h"],
-#     visibility = ["//visibility:public"],
-# )
 # end:google_only
diff --git a/protos/requires.h b/protos/requires.h
deleted file mode 100644
index f7ea016392..0000000000
--- a/protos/requires.h
+++ /dev/null
@@ -1,17 +0,0 @@
-#ifndef THIRD_PARTY_UPB_PROTOS_REQUIRES_H_
-#define THIRD_PARTY_UPB_PROTOS_REQUIRES_H_
-
-#include <type_traits>
-namespace protos::internal {
-// Ports C++20 `requires` to C++17.
-// C++20 ideal:
-//  if constexpr (requires { t.foo(); }) { ... }
-// Our C++17 stopgap solution:
-//  if constexpr (Requires<T>([](auto x) -> decltype(x.foo()) {})) { ... }
-template <typename... T, typename F>
-constexpr bool Requires(F) {
-  return std::is_invocable_v<F, T...>;
-}
-}  // namespace protos::internal
-
-#endif  // THIRD_PARTY_UPB_PROTOS_REQUIRES_H_