diff --git a/third_party/2and3/dateutil/parser.pyi b/third_party/2and3/dateutil/parser.pyi
index da84aa7b5..78c6965af 100644
--- a/third_party/2and3/dateutil/parser.pyi
+++ b/third_party/2and3/dateutil/parser.pyi
@@ -48,3 +48,4 @@ DEFAULTTZPARSER: _tzparser
 class InvalidDatetimeError(ValueError): ...
 class InvalidDateError(InvalidDatetimeError): ...
 class InvalidTimeError(InvalidDatetimeError): ...
+class ParserError(ValueError): ...