diff --git a/BaseTools/Source/Python/AutoGen/GenMake.py b/BaseTools/Source/Python/AutoGen/GenMake.py
index 1bb5163e73..a373507422 100644
--- a/BaseTools/Source/Python/AutoGen/GenMake.py
+++ b/BaseTools/Source/Python/AutoGen/GenMake.py
@@ -427,8 +427,6 @@ cleanlib:
         self.ResultFileList = []
         self.IntermediateDirectoryList = ["$(DEBUG_DIR)", "$(OUTPUT_DIR)"]
 
-        self.SourceFileDatabase = {}        # {file type : file path}
-        self.DestFileDatabase = {}          # {file type : file path}
         self.FileBuildTargetList = []       # [(src, target string)]
         self.BuildTargetList = []           # [target string]
         self.PendingBuildTargetList = []    # [FileBuildRule objects]