diff --git a/src/cocoa/i_joystick.cpp b/src/cocoa/i_joystick.cpp
index add1b1bd7..5a1c92e8c 100644
--- a/src/cocoa/i_joystick.cpp
+++ b/src/cocoa/i_joystick.cpp
@@ -376,7 +376,7 @@ FString IOKitJoystick::GetIdentifier()
 {
 	char identifier[ 32 ] = {0};
 	
-	snprintf( identifier, sizeof( identifier ), "VID_%04lx_PID_%04lx", 
+	snprintf( identifier, sizeof( identifier ), "VID_%04x_PID_%04x", 
 		IOHIDDevice_GetVendorID( m_device ), IOHIDDevice_GetProductID( m_device ) );
 	
 	return FString( identifier );