diff --git a/services/inputflinger/include/InputReaderBase.h b/services/inputflinger/include/InputReaderBase.h
index 8ad5dd0..c7720cb 100644
--- a/services/inputflinger/include/InputReaderBase.h
+++ b/services/inputflinger/include/InputReaderBase.h
@@ -270,6 +270,8 @@
             pointerGestureZoomSpeedRatio(0.3f),
             showTouches(false), pointerCapture(false) { }
 
+    static std::string changesToString(uint32_t changes);
+
     std::optional<DisplayViewport> getDisplayViewportByType(ViewportType type) const;
     std::optional<DisplayViewport> getDisplayViewportByUniqueId(const std::string& uniqueDisplayId)
             const;