diff --git a/include/input/Input.h b/include/input/Input.h
index a976246..ad8c233 100644
--- a/include/input/Input.h
+++ b/include/input/Input.h
@@ -24,6 +24,7 @@
  */
 
 #include <android/input.h>
+#include <math.h>
 #include <stdint.h>
 #include <utils/BitSet.h>
 #include <utils/KeyedVector.h>
@@ -476,6 +477,8 @@
 
     float getYCursorPosition() const;
 
+    static inline bool isValidCursorPosition(float x, float y) { return !isnan(x) && !isnan(y); }
+
     inline nsecs_t getDownTime() const { return mDownTime; }
 
     inline void setDownTime(nsecs_t downTime) { mDownTime = downTime; }