diff --git a/vyper/exceptions.py b/vyper/exceptions.py
index 5621c3241b..3bde20356e 100644
--- a/vyper/exceptions.py
+++ b/vyper/exceptions.py
@@ -339,4 +339,4 @@ class TypeCheckFailure(VyperInternalException):
 
 
 class InvalidABIType(VyperInternalException):
-    """An internal routine constructed an invalid ABI type""
+    """An internal routine constructed an invalid ABI type"""