diff --git a/EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ebc/CpuBreakpoint.c b/EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ebc/CpuBreakpoint.c
index f98d1073bb..1fda0b3bf9 100644
--- a/EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ebc/CpuBreakpoint.c
+++ b/EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ebc/CpuBreakpoint.c
@@ -21,12 +21,6 @@ Abstract:
 
 #include "BaseLibInternals.h"
 
-extern
-UINT64
-_break (
-  CHAR8 BreakCode
-  );
-
 /**
   Generates a breakpoint on the CPU.