diff --git a/libs/gui/tests/Surface_test.cpp b/libs/gui/tests/Surface_test.cpp
index 2c02ba6..6e196bf 100644
--- a/libs/gui/tests/Surface_test.cpp
+++ b/libs/gui/tests/Surface_test.cpp
@@ -581,6 +581,9 @@
             Vector<DisplayInfo>* /*configs*/) override { return NO_ERROR; }
     status_t getDisplayStats(const sp<IBinder>& /*display*/,
             DisplayStatInfo* /*stats*/) override { return NO_ERROR; }
+    status_t getDisplayViewport(const sp<IBinder>& /*display*/, Rect* /*outViewport*/) override {
+        return NO_ERROR;
+    }
     int getActiveConfig(const sp<IBinder>& /*display*/) override { return 0; }
     status_t setActiveConfig(const sp<IBinder>& /*display*/, int /*id*/)
             override {