diff --git a/include/input/Input.h b/include/input/Input.h
index 1c4ea6b..7b253a5 100644
--- a/include/input/Input.h
+++ b/include/input/Input.h
@@ -515,6 +515,8 @@
     PointerProperties& operator=(const PointerProperties&) = default;
 };
 
+std::ostream& operator<<(std::ostream& out, const PointerProperties& properties);
+
 // TODO(b/211379801) : Use a strong type from ftl/mixins.h instead
 using DeviceId = int32_t;