diff --git a/src/driver-sinowealth.c b/src/driver-sinowealth.c
index da5c9536..60e8c84d 100644
--- a/src/driver-sinowealth.c
+++ b/src/driver-sinowealth.c
@@ -44,6 +44,7 @@
 
 #define SINOWEALTH_BUTTON_TYPE_BUTTON 0x11
 #define SINOWEALTH_BUTTON_TYPE_KEY 0x21
+#define SINOWEALTH_BUTTON_TPYE_SWITCH_DPI 0x41
 #define SINOWEALTH_BUTTON_TYPE_DISABLED 0x50
 
 struct sinowealth_rgb8 {