diff --git a/cpp/core/internal/mediums/webrtc/signaling_frames_test.cc b/cpp/core/internal/mediums/webrtc/signaling_frames_test.cc
index aabd3866..6fe8384a 100644
--- a/cpp/core/internal/mediums/webrtc/signaling_frames_test.cc
+++ b/cpp/core/internal/mediums/webrtc/signaling_frames_test.cc
@@ -86,11 +86,11 @@ TEST(SignalingFramesTest, SignalingPoke) {
   location::nearby::mediums::WebRtcSignalingFrame frame;
   frame.ParseFromString(std::string(encoded_poke.data(), encoded_poke.size()));
 
-  EXPECT_THAT(frame, testing::EqualsProto(R"(
+  EXPECT_THAT(frame, testing::EqualsProto(R"pb(
                 sender_id { id: "abc" }
                 type: READY_FOR_SIGNALING_POKE_TYPE
                 ready_for_signaling_poke {}
-              )"));
+              )pb"));
 }
 
 TEST(SignalingFramesTest, EncodeValidOffer) {