diff --git a/vuinputd-tests/src/devices/mod.rs b/vuinputd-tests/src/devices/mod.rs
index 9d77113..5d8fd9b 100644
--- a/vuinputd-tests/src/devices/mod.rs
+++ b/vuinputd-tests/src/devices/mod.rs
@@ -21,6 +21,7 @@ pub const EV_SYN: u16 = 0x00;
 pub const EV_KEY: u16 = 0x01;
 pub const EV_REL: u16 = 0x02;
 pub const EV_ABS: u16 = 0x03;
+pub const EV_FF: u16 = 0x15;
 
 /// Trait for input devices
 pub trait Device {