diff --git a/services/bidding_service/generate_bids_reactor.cc b/services/bidding_service/generate_bids_reactor.cc
index ecb66e57..8b934d84 100644
--- a/services/bidding_service/generate_bids_reactor.cc
+++ b/services/bidding_service/generate_bids_reactor.cc
@@ -115,7 +115,7 @@ constexpr char kJsonStringValueStart[] = R"JSON(":")JSON";
 constexpr char kJsonValueStart[] = R"JSON(":)JSON";
 constexpr char kJsonValueEnd[] = R"JSON(,")JSON";
 constexpr char kJsonEmptyString[] = R"JSON("")JSON";
-constexpr char kEmptyDeviceSignals[] = R"JSON("{}")JSON";
+constexpr char kEmptyDeviceSignals[] = R"JSON({})JSON";
 
 std::string MakeBrowserSignalsForScript(absl::string_view publisher_name,
                                         absl::string_view seller,
diff --git a/services/bidding_service/generate_bids_reactor_test.cc b/services/bidding_service/generate_bids_reactor_test.cc
index f82aff92..c62ee78f 100644
--- a/services/bidding_service/generate_bids_reactor_test.cc
+++ b/services/bidding_service/generate_bids_reactor_test.cc
@@ -767,7 +767,7 @@ TEST_F(GenerateBidsReactorTest, GeneratesBidDespiteNoBrowserSignals) {
         IGForBidding received;
         EXPECT_EQ(*input[3], expected_signals);
         // Check that device signals are an empty JSON object.
-        EXPECT_EQ(*input[4], R"JSON("{}")JSON");
+        EXPECT_EQ(*input[4], R"JSON({})JSON");
         return FakeExecute(batch, std::move(batch_callback), response_json);
       });
   RawRequest raw_request;