diff --git a/common/xrdp_constants.h b/common/xrdp_constants.h
index 14028032..94376cb6 100644
--- a/common/xrdp_constants.h
+++ b/common/xrdp_constants.h
@@ -595,11 +595,16 @@
 #define  SOLIDPATTERNBRUSHONLY         0x0040
 #define  ORDERFLAGS_EXTRA_FLAGS        0x0080
 
-#define  INPUT_FLAG_SCANCODES       0x0001
-#define  INPUT_FLAG_MOUSEX          0x0004
-#define  INPUT_FLAG_FASTPATH_INPUT  0x0008
-#define  INPUT_FLAG_UNICODE         0x0010
-#define  INPUT_FLAG_FASTPATH_INPUT2 0x0020
+/* Input Capability Set (MS-RDPBCGR 2.2.7.1.6) */
+#define  INPUT_FLAG_SCANCODES          0x0001
+#define  INPUT_FLAG_MOUSEX             0x0004
+#define  INPUT_FLAG_FASTPATH_INPUT     0x0008
+#define  INPUT_FLAG_UNICODE            0x0010
+#define  INPUT_FLAG_FASTPATH_INPUT2    0x0020
+#define  INPUT_FLAG_UNUSED1            0x0040
+#define  INPUT_FLAG_UNUSED2            0x0080
+#define  TS_INPUT_FLAG_MOUSE_HWHEEL    0x0100
+#define  TS_INPUT_FLAG_QOE_TIMESTAMPS  0x0200
 
 #define  COMPDESK_NOT_SUPPORTED      0x0000
 #define  COMPDESK_SUPPORTED          0x0001