diff --git a/zipline/utils/exception_utils.py b/zipline/utils/exception_utils.py
deleted file mode 100644
index 67dc1ee9..00000000
--- a/zipline/utils/exception_utils.py
+++ /dev/null
@@ -1,16 +0,0 @@
-from textwrap import dedent
-
-class CustomException(Exception):
-    argmap = {0: 'classname'}
-
-    def __init__(self, *args):
-        self.args = args
-
-    def format(self):
-        assert len(self.args) == len(self.argmap), \
-            """Wrong number of arguments passed to custom exception %s.""" \
-            % self.__class__
-        return self.message.format(**dict(zip(self.argmap, self.args)))
-
-    def __str__(self):
-        return dedent(self.format()).strip('\n')