diff --git a/MdePkg/Include/Protocol/SimpleTextInEx.h b/MdePkg/Include/Protocol/SimpleTextInEx.h
index bb88a8ec60..dc176a1141 100644
--- a/MdePkg/Include/Protocol/SimpleTextInEx.h
+++ b/MdePkg/Include/Protocol/SimpleTextInEx.h
@@ -126,6 +126,7 @@ typedef struct {
 //
 #define SCAN_F11                  0x0015
 #define SCAN_F12                  0x0016
+#define SCAN_PAUSE                0x0048
 #define SCAN_F13                  0x0068
 #define SCAN_F14                  0x0069
 #define SCAN_F15                  0x006A