diff --git a/BaseTools/Source/Python/AutoGen/ModuleAutoGen.py b/BaseTools/Source/Python/AutoGen/ModuleAutoGen.py
index fad5bab0f2..f0812b6887 100755
--- a/BaseTools/Source/Python/AutoGen/ModuleAutoGen.py
+++ b/BaseTools/Source/Python/AutoGen/ModuleAutoGen.py
@@ -1843,7 +1843,7 @@ class ModuleAutoGen(AutoGen):
         # CanSkip uses timestamps to determine build skipping
         if self.CanSkip():
             return
-
+        self.LibraryAutoGenList
         AutoGenList = []
         IgoredAutoGenList = []