diff --git a/stdlib/3/email/errors.pyi b/stdlib/3/email/errors.pyi
index 77d9902cc..73e0b800f 100644
--- a/stdlib/3/email/errors.pyi
+++ b/stdlib/3/email/errors.pyi
@@ -11,9 +11,10 @@ class NoBoundaryInMultipartDefect(MessageDefect): ...
 class StartBoundaryNotFoundDefect(MessageDefect): ...
 class FirstHeaderLineIsContinuationDefect(MessageDefect): ...
 class MisplacedEnvelopeHeaderDefect(MessageDefect): ...
-class MalformedHeaderDefect(MessageDefect): ...
 class MultipartInvariantViolationDefect(MessageDefect): ...
 class InvalidBase64PaddingDefect(MessageDefect): ...
 class InvalidBase64CharactersDefect(MessageDefect): ...
 class CloseBoundaryNotFoundDefect(MessageDefect): ...
 class MissingHeaderBodySeparatorDefect(MessageDefect): ...
+
+MalformedHeaderDefect = MissingHeaderBodySeparatorDefect