diff --git a/Mac/Lib/lib-scriptpackages/Terminal/Terminal_Suite.py b/Mac/Lib/lib-scriptpackages/Terminal/Terminal_Suite.py
index 8fe78b10cc8..17aaf476e9e 100644
--- a/Mac/Lib/lib-scriptpackages/Terminal/Terminal_Suite.py
+++ b/Mac/Lib/lib-scriptpackages/Terminal/Terminal_Suite.py
@@ -25,7 +25,7 @@ class Terminal_Suite_Events:
 
 		_reply, _arguments, _attributes = self.send(_code, _subcode,
 				_arguments, _attributes)
-		if _arguments.has_key('errn'):
+		if _arguments.get('errn', 0):
 			raise aetools.Error, aetools.decodeerror(_arguments)
 		# XXXX Optionally decode result
 		if _arguments.has_key('----'):
@@ -44,7 +44,7 @@ class Terminal_Suite_Events:
 
 		_reply, _arguments, _attributes = self.send(_code, _subcode,
 				_arguments, _attributes)
-		if _arguments.has_key('errn'):
+		if _arguments.get('errn', 0):
 			raise aetools.Error, aetools.decodeerror(_arguments)
 		# XXXX Optionally decode result
 		if _arguments.has_key('----'):
@@ -65,7 +65,7 @@ class Terminal_Suite_Events:
 
 		_reply, _arguments, _attributes = self.send(_code, _subcode,
 				_arguments, _attributes)
-		if _arguments.has_key('errn'):
+		if _arguments.get('errn', 0):
 			raise aetools.Error, aetools.decodeerror(_arguments)
 		# XXXX Optionally decode result
 		if _arguments.has_key('----'):
@@ -89,7 +89,7 @@ class Terminal_Suite_Events:
 
 		_reply, _arguments, _attributes = self.send(_code, _subcode,
 				_arguments, _attributes)
-		if _arguments.has_key('errn'):
+		if _arguments.get('errn', 0):
 			raise aetools.Error, aetools.decodeerror(_arguments)
 		# XXXX Optionally decode result
 		if _arguments.has_key('----'):