diff --git a/mitogen/ssh.py b/mitogen/ssh.py
index 1893fdc9..d59bc159 100644
--- a/mitogen/ssh.py
+++ b/mitogen/ssh.py
@@ -43,7 +43,7 @@ PASSWORD_PROMPT = 'password'
 PERMDENIED_PROMPT = 'permission denied'
 
 
-class PasswordError(mitogen.core.Error):
+class PasswordError(mitogen.core.StreamError):
     pass
 
 
diff --git a/mitogen/sudo.py b/mitogen/sudo.py
index 3295083e..96c37e90 100644
--- a/mitogen/sudo.py
+++ b/mitogen/sudo.py
@@ -98,7 +98,7 @@ def parse_sudo_flags(args):
     return opts
 
 
-class PasswordError(mitogen.core.Error):
+class PasswordError(mitogen.core.StreamError):
     pass