diff --git a/BaseTools/Source/Python/Workspace/DscBuildData.py b/BaseTools/Source/Python/Workspace/DscBuildData.py
index b7b4b610ca..6106f8ee55 100644
--- a/BaseTools/Source/Python/Workspace/DscBuildData.py
+++ b/BaseTools/Source/Python/Workspace/DscBuildData.py
@@ -1899,12 +1899,15 @@ class DscBuildData(PlatformBuildClassObject):
                     IsArray = IsFieldValueAnArray(FieldList[FieldName][0])
                     if IsArray:
                         try:
-                            FieldList[FieldName][0] = ValueExpressionEx(FieldList[FieldName][0], TAB_VOID, self._GuidDict)(True)
+                            FieldValue = ValueExpressionEx(FieldList[FieldName][0], TAB_VOID, self._GuidDict)(True)
                         except BadExpression:
                             EdkLogger.error('Build', FORMAT_INVALID, "Invalid value format for %s. From %s Line %d " %
                                             (".".join((Pcd.TokenSpaceGuidCName, Pcd.TokenCName, FieldName)), FieldList[FieldName][1], FieldList[FieldName][2]))
                     try:
-                        Value, ValueSize = ParseFieldValue (FieldList[FieldName][0])
+                        if IsArray:
+                            Value, ValueSize = ParseFieldValue (FieldValue)
+                        else:
+                            Value, ValueSize = ParseFieldValue (FieldList[FieldName][0])
                     except Exception:
                         EdkLogger.error('Build', FORMAT_INVALID, "Invalid value format for %s. From %s Line %d " % (".".join((Pcd.TokenSpaceGuidCName, Pcd.TokenCName, FieldName)), FieldList[FieldName][1], FieldList[FieldName][2]))
                     if isinstance(Value, str):