diff --git a/BaseTools/Source/Python/build/build.py b/BaseTools/Source/Python/build/build.py
index 6fb2e0ed3d..ede963bc23 100644
--- a/BaseTools/Source/Python/build/build.py
+++ b/BaseTools/Source/Python/build/build.py
@@ -1604,9 +1604,7 @@ class Build():
                         SmmModuleList[Module.MetaFile] = ImageInfo
                         SmmSize += ImageInfo.Image.Size
                         if Module.ModuleType == 'DXE_SMM_DRIVER':
-                            PiSpecVersion = '0x00000000'
-                            if 'PI_SPECIFICATION_VERSION' in Module.Module.Specification:
-                                PiSpecVersion = Module.Module.Specification['PI_SPECIFICATION_VERSION']
+                            PiSpecVersion = Module.Module.Specification.get('PI_SPECIFICATION_VERSION', '0x00000000')
                             # for PI specification < PI1.1, DXE_SMM_DRIVER also runs as BOOT time driver.
                             if int(PiSpecVersion, 16) < 0x0001000A:
                                 BtModuleList[Module.MetaFile] = ImageInfo