diff --git a/infra/indexer/frontend/frontend.cc b/infra/indexer/frontend/frontend.cc
index 96083ba7fa29..896aed64eb48 100644
--- a/infra/indexer/frontend/frontend.cc
+++ b/infra/indexer/frontend/frontend.cc
@@ -110,6 +110,7 @@ clang::tooling::CommandLineArguments ExtraArgumentsAdjuster(
   std::vector<std::string> extra_args = frontend_internal::ParseCommandLine(
       absl::GetFlag(FLAGS_extra_compiler_args));
   result.insert(result.end(), extra_args.begin(), extra_args.end());
+  result.push_back("-Wno-error");
   return result;
 }
 }  // namespace
diff --git a/infra/indexer/frontend/frontend_test.cc b/infra/indexer/frontend/frontend_test.cc
index 54b863d657c7..9b68e7a2b41a 100644
--- a/infra/indexer/frontend/frontend_test.cc
+++ b/infra/indexer/frontend/frontend_test.cc
@@ -3863,5 +3863,13 @@ TEST(FrontendTest, AliasedSymbol) {
   EXPECT_HAS_ENTITY(index, Entity::Kind::kFunction, "", "bar", "()",
                     "snippet.cc", 2, 2);
 }
+
+TEST(FrontendTest, NoWarningsAsErrors) {
+  auto index =
+      GetSnippetIndex("int main() { int unused; }",
+                      /*extra_args=*/{"-Werror", "-Wunused"},
+                      /*fail_on_error=*/true);
+  EXPECT_NE(index, nullptr);
+}
 }  // namespace indexer
 }  // namespace oss_fuzz