diff --git a/.bazelrc b/.bazelrc
index 9379244c5..800e4a84a 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -14,6 +14,9 @@ common --experimental_merged_skyframe_analysis_execution
 common --repo_env=CC=clang
 # Required by abseil-cpp.
 build --cxxopt=-std=c++14
+# Silence protobuf compilation warnings.
+build --host_copt=-Wno-unused-function
+build --host_copt=-Wno-unknown-warning-option
 # Requires a relatively modern clang.
 build:ci --features=layering_check
 build:macos --apple_crosstool_top=@local_config_apple_cc//:toolchain