diff --git a/EdkCompatibilityPkg/Foundation/Framework/Ppi/Variable/Variable.h b/EdkCompatibilityPkg/Foundation/Framework/Ppi/Variable/Variable.h
index 8257b68bf6..b62e5e3fc4 100644
--- a/EdkCompatibilityPkg/Foundation/Framework/Ppi/Variable/Variable.h
+++ b/EdkCompatibilityPkg/Foundation/Framework/Ppi/Variable/Variable.h
@@ -55,8 +55,6 @@ typedef struct PEI_READ_ONLY_VARIABLE_PPI {
   PEI_GET_NEXT_VARIABLE_NAME  PeiGetNextVariableName;
 } PEI_READ_ONLY_VARIABLE_PPI;
 
-EFI_FORWARD_DECLARATION (PEI_MASTER_BOOT_MODE_PPI);
-
 extern EFI_GUID gPeiReadOnlyVariablePpiGuid;
 
 #endif