diff --git a/BootloaderCorePkg/Tools/PatchFv.py b/BootloaderCorePkg/Tools/PatchFv.py
index 07a41bf8..e22fe9d5 100644
--- a/BootloaderCorePkg/Tools/PatchFv.py
+++ b/BootloaderCorePkg/Tools/PatchFv.py
@@ -836,7 +836,7 @@ class Symbols:
 #
 #  Print out the usage
 #
-def usage():
+def Usage():
     print "Usage: \n\tPatchFv FvBuildDir [FvFileBaseNames:]FdFileBaseNameToPatch \"Offset, Value\""
 
 def main():