diff --git a/hwc2_device/HwcDisplayConfigs.h b/hwc2_device/HwcDisplayConfigs.h
index 98067c1..33dcb81 100644
--- a/hwc2_device/HwcDisplayConfigs.h
+++ b/hwc2_device/HwcDisplayConfigs.h
@@ -39,7 +39,7 @@
 
 struct HwcDisplayConfigs {
   HWC2::Error Update(DrmConnector &conn);
-  void FillHeadless();
+  void GenFakeMode(uint16_t width, uint16_t height);
 
   std::map<uint32_t /*config_id*/, struct HwcDisplayConfig> hwc_configs;