diff --git a/BaseTools/Source/Python/build/build.py b/BaseTools/Source/Python/build/build.py
index bcd832c525..6c8798ef93 100755
--- a/BaseTools/Source/Python/build/build.py
+++ b/BaseTools/Source/Python/build/build.py
@@ -2064,7 +2064,7 @@ class Build():
             if Fdf.CurrentFdName and Fdf.CurrentFdName in Fdf.Profile.FdDict:
                 FdDict = Fdf.Profile.FdDict[Fdf.CurrentFdName]
                 for FdRegion in FdDict.RegionList:
-                    if str(FdRegion.RegionType) is 'FILE' and self.Platform.VpdToolGuid in str(FdRegion.RegionDataList):
+                    if str(FdRegion.RegionType) == 'FILE' and self.Platform.VpdToolGuid in str(FdRegion.RegionDataList):
                         if int(FdRegion.Offset) % 8 != 0:
                             EdkLogger.error("build", FORMAT_INVALID, 'The VPD Base Address %s must be 8-byte aligned.' % (FdRegion.Offset))
             Wa.FdfProfile = Fdf.Profile