diff --git a/MdePkg/Include/Library/DebugLib.h b/MdePkg/Include/Library/DebugLib.h
index f859e55f2d..bccb0e920a 100644
--- a/MdePkg/Include/Library/DebugLib.h
+++ b/MdePkg/Include/Library/DebugLib.h
@@ -35,6 +35,7 @@
 #define DEBUG_POOL      0x00000010  // Alloc & Free's
 #define DEBUG_PAGE      0x00000020  // Alloc & Free's
 #define DEBUG_INFO      0x00000040  // Verbose
+#define DEBUG_DISPATCH  0x00000080  // PEI/DXE Dispatchers
 #define DEBUG_VARIABLE  0x00000100  // Variable
 #define DEBUG_BM        0x00000400  // Boot Manager
 #define DEBUG_BLKIO     0x00001000  // BlkIo Driver
@@ -54,6 +55,7 @@
 #define EFI_D_POOL      DEBUG_POOL
 #define EFI_D_PAGE      DEBUG_PAGE
 #define EFI_D_INFO      DEBUG_INFO
+#define EFI_D_DISPATCH  DEBUG_DISPATCH
 #define EFI_D_VARIABLE  DEBUG_VARIABLE
 #define EFI_D_BM        DEBUG_BM
 #define EFI_D_BLKIO     DEBUG_BLKIO