diff --git a/hwc3/ComposerClient.cpp b/hwc3/ComposerClient.cpp
index fd4dedc..124f5ea 100644
--- a/hwc3/ComposerClient.cpp
+++ b/hwc3/ComposerClient.cpp
@@ -1293,6 +1293,11 @@
   return ToBinderStatus(hwc3::Error::kUnsupported);
 }
 
+ndk::ScopedAStatus ComposerClient::startHdcpNegotiation(
+    int64_t /*display*/, const AidlHdcpLevels& /*levels*/) {
+  return ToBinderStatus(hwc3::Error::kUnsupported);
+}
+
 #endif
 
 ndk::ScopedAStatus ComposerClient::getMaxLayerPictureProfiles(int64_t, int32_t*) {
diff --git a/hwc3/ComposerClient.h b/hwc3/ComposerClient.h
index 45f0a4c..e287d58 100644
--- a/hwc3/ComposerClient.h
+++ b/hwc3/ComposerClient.h
@@ -25,6 +25,7 @@
 #include "hwc3/Utils.h"
 #include "utils/Mutex.h"
 
+using AidlHdcpLevels = aidl::android::hardware::drm::HdcpLevels;
 using AidlPixelFormat = aidl::android::hardware::graphics::common::PixelFormat;
 using AidlNativeHandle = aidl::android::hardware::common::NativeHandle;
 
@@ -149,6 +150,8 @@
   ndk::ScopedAStatus notifyExpectedPresent(
       int64_t display, const ClockMonotonicTimestamp& expected_present_time,
       int32_t frame_interval_ns) override;
+  ndk::ScopedAStatus startHdcpNegotiation(int64_t display,
+      const AidlHdcpLevels& levels) override;
 
 #endif