diff --git a/BaseTools/Source/Python/Eot/EotMain.py b/BaseTools/Source/Python/Eot/EotMain.py
index 56aa48d2a1..3020f6525e 100644
--- a/BaseTools/Source/Python/Eot/EotMain.py
+++ b/BaseTools/Source/Python/Eot/EotMain.py
@@ -1105,7 +1105,7 @@ class MultipleFv(FirmwareVolume):
             Fv.frombuffer(Buf, 0, len(Buf))
 
             self.BasicInfo.append([Fv.Name, Fv.FileSystemGuid, Fv.Size])
-            self.FfsDict.append(Fv.FfsDict)
+            self.FfsDict.update(Fv.FfsDict)
 
 ## Class Eot
 #