diff --git a/BaseTools/Source/Python/Workspace/BuildClassObject.py b/BaseTools/Source/Python/Workspace/BuildClassObject.py
index 1df042f41c..1c2385f761 100644
--- a/BaseTools/Source/Python/Workspace/BuildClassObject.py
+++ b/BaseTools/Source/Python/Workspace/BuildClassObject.py
@@ -270,6 +270,7 @@ class StructurePcd(PcdClassObject):
         self.ValueChain = set()
         self.PcdFieldValueFromComm = OrderedDict()
         self.PcdFieldValueFromFdf = OrderedDict()
+        self.DefaultFromDSC=None
     def __repr__(self):
         return self.TypeName
 
@@ -326,7 +327,6 @@ class StructurePcd(PcdClassObject):
             self.PackageDecs = PcdObject.PackageDecs if PcdObject.PackageDecs else self.PackageDecs
             self.DefaultValues = PcdObject.DefaultValues if PcdObject.DefaultValues else self.DefaultValues
             self.PcdMode = PcdObject.PcdMode if PcdObject.PcdMode else self.PcdMode
-            self.DefaultFromDSC=None
             self.DefaultValueFromDec = PcdObject.DefaultValueFromDec if PcdObject.DefaultValueFromDec else self.DefaultValueFromDec
             self.SkuOverrideValues = PcdObject.SkuOverrideValues if PcdObject.SkuOverrideValues else self.SkuOverrideValues
             self.StructName = PcdObject.DatumType if PcdObject.DatumType else self.StructName