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-rw-r--r--BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py b/BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py
index 3dc73c8f61..4d8b2bdee2 100644
--- a/BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py
+++ b/BaseTools/Source/Python/GenFds/GenFdsGlobalVariable.py
@@ -742,7 +742,7 @@ class GenFdsGlobalVariable:
# @param MacroDict Dictionary that contains macro value pair
#
@staticmethod
- def MacroExtend (Str, MacroDict={}, Arch=DataType.TAB_COMMON):
+ def MacroExtend (Str, MacroDict=None, Arch=DataType.TAB_COMMON):
if Str is None:
return None