diff --git a/libs/vr/libvrflinger/hardware_composer.cpp b/libs/vr/libvrflinger/hardware_composer.cpp
index 188ac6b..b771538 100644
--- a/libs/vr/libvrflinger/hardware_composer.cpp
+++ b/libs/vr/libvrflinger/hardware_composer.cpp
@@ -1215,6 +1215,12 @@
   return Void();
 }
 
+Return<void> HardwareComposer::ComposerCallback::onSeamlessPossible(
+    Hwc2::Display /*display*/) {
+  LOG_ALWAYS_FATAL("Unexpected onSeamlessPossible callback");
+  return Void();
+}
+
 void HardwareComposer::ComposerCallback::SetVsyncService(
     const sp<VsyncService>& vsync_service) {
   std::lock_guard<std::mutex> lock(mutex_);
diff --git a/libs/vr/libvrflinger/hardware_composer.h b/libs/vr/libvrflinger/hardware_composer.h
index 8698814..bfce10b 100644
--- a/libs/vr/libvrflinger/hardware_composer.h
+++ b/libs/vr/libvrflinger/hardware_composer.h
@@ -381,6 +381,7 @@
     hardware::Return<void> onVsyncPeriodTimingChanged(
         Hwc2::Display display,
         const Hwc2::VsyncPeriodChangeTimeline& updatedTimeline) override;
+    hardware::Return<void> onSeamlessPossible(Hwc2::Display display) override;
 
     bool GotFirstHotplug() { return got_first_hotplug_; }
     void SetVsyncService(const sp<VsyncService>& vsync_service);