diff --git a/contexthub/1.2/default/Contexthub.cpp b/contexthub/1.2/default/Contexthub.cpp
index d7ac7bf..8bc028e 100644
--- a/contexthub/1.2/default/Contexthub.cpp
+++ b/contexthub/1.2/default/Contexthub.cpp
@@ -17,12 +17,25 @@
 
 #include <vector>
 
+using ::android::hardware::contexthub::V1_0::Result;
+
 namespace android {
 namespace hardware {
 namespace contexthub {
 namespace V1_2 {
 namespace implementation {
 
+// TODO(b/166846988): Implement new methods.
+Return<Result> Contexthub::registerCallback_1_2(uint32_t /* hubId */,
+                                                const sp<IContexthubCallback>& /* cb */) {
+    return Result::UNKNOWN_FAILURE;
+}
+
+Return<Result> Contexthub::sendMessageToHub_1_2(uint32_t /* hubId */,
+                                                const ContextHubMsg& /* msg */) {
+    return Result::UNKNOWN_FAILURE;
+}
+
 Return<void> Contexthub::onSettingChanged(SettingV1_1 /*setting*/, SettingValue /*newValue*/) {
     return Void();
 }