diff --git a/toolchain/indenter.py b/toolchain/indenter.py
index a535ccc2e..284e27519 100644
--- a/toolchain/indenter.py
+++ b/toolchain/indenter.py
@@ -5,7 +5,7 @@
 def main():
     num_args = len(sys.argv)
     if num_args != 2:
-        raise Exception('Invalid number of arguments, found ', num_args)
+        raise ValueError('Invalid number of arguments, found ', num_args)
 
     infile = str(sys.argv[1])
     outfile = infile+".new"