diff --git a/udev_device.c b/udev_device.c
index 47dd00f..d9ca6c7 100644
--- a/udev_device.c
+++ b/udev_device.c
@@ -44,6 +44,10 @@
 #define INPUT_PROP_ACCELEROMETER 0x06
 #endif
 
+#ifndef INPUT_PROP_CNT
+#define INPUT_PROP_CNT 0x20
+#endif
+
 struct udev_device {
     struct udev_list_entry properties;
     struct udev_list_entry sysattrs;