diff --git a/MdePkg/Include/Library/ReportStatusCodeLib.h b/MdePkg/Include/Library/ReportStatusCodeLib.h
index 626ad11e28..2dfa8f839b 100644
--- a/MdePkg/Include/Library/ReportStatusCodeLib.h
+++ b/MdePkg/Include/Library/ReportStatusCodeLib.h
@@ -28,11 +28,6 @@
 // Extended Data structure definitions with EFI_STATUS_CODE_DATA headers removed
 //
 
-//
-// Extern for the modules Caller ID GUID
-//
-extern EFI_GUID gEfiCallerIdGuid;
-
 /**
   Converts a status code to an 8-bit POST code value.