diff --git a/requests/exceptions.py b/requests/exceptions.py
index 82797664..0aeb43fc 100644
--- a/requests/exceptions.py
+++ b/requests/exceptions.py
@@ -85,10 +85,6 @@ class InvalidHeader(RequestException, ValueError):
     """The header value provided was somehow invalid."""
 
 
-class InvalidHeader(RequestException, ValueError):
-    """The header value provided was somehow invalid."""
-
-
 class ChunkedEncodingError(RequestException):
     """The server declared chunked encoding but sent an invalid chunk."""