diff --git a/bazel/external/quiche.patch b/bazel/external/quiche.patch
index e69de29bb2d1..9d3190f47937 100644
--- a/bazel/external/quiche.patch
+++ b/bazel/external/quiche.patch
@@ -0,0 +1,12 @@
+# This patch is needed for compilation with MacOS toolchains.
+--- http2/adapter/oghttp2_session.cc
++++ http2/adapter/oghttp2_session.cc
+@@ -427,7 +427,7 @@ OgHttp2Session::ProcessBytesImpl(absl::string_view bytes) {
+     if (!remaining_preface_.empty()) {
+       QUICHE_VLOG(2) << "Preface bytes remaining: "
+                      << remaining_preface_.size();
+-      return min_size;
++      return static_cast<int64_t>(min_size);
+     }
+     preface_consumed = min_size;
+   }