diff --git a/BaseTools/Source/Python/Common/GlobalData.py b/BaseTools/Source/Python/Common/GlobalData.py
index 3933e86cb9..f872066057 100644
--- a/BaseTools/Source/Python/Common/GlobalData.py
+++ b/BaseTools/Source/Python/Common/GlobalData.py
@@ -59,6 +59,8 @@ _GuidPattern = r"{Hex}{{8}}-{Hex}{{4}}-{Hex}{{4}}-{Hex}{{4}}-{Hex}{{12}}".format
 gGuidPattern = re.compile(r'{}'.format(_GuidPattern))
 gGuidPatternEnd = re.compile(r'{}$'.format(_GuidPattern))
 
+g4HexChar = re.compile(r'{}{{4}}'.format(_HexChar))
+
 #
 # A global variable for whether current build in AutoGen phase or not.
 #