diff --git a/Lib/aifc.py b/Lib/aifc.py
index 653dac9..aa1e56c 100644
--- a/Lib/aifc.py
+++ b/Lib/aifc.py
@@ -133,7 +133,7 @@
 # changed by calling aiff() or aifc() before the first writeframes or
 # writeframesraw.
 
-import builtin
+import __builtin__
 try:
 	import CL
 except ImportError:
@@ -410,7 +410,7 @@
 
 	def __init__(self, f):
 		if type(f) == type(''):
-			f = builtin.open(f, 'r')
+			f = __builtin__.open(f, 'r')
 		# else, assume it is an open file object already
 		self.initfp(f)
 
@@ -616,7 +616,7 @@
 	def __init__(self, f):
 		if type(f) == type(''):
 			filename = f
-			f = builtin.open(f, 'w')
+			f = __builtin__.open(f, 'w')
 		else:
 			# else, assume it is an open file object already
 			filename = '???'
diff --git a/Lib/sunau.py b/Lib/sunau.py
index 17fa60d..631d9e8 100644
--- a/Lib/sunau.py
+++ b/Lib/sunau.py
@@ -153,8 +153,8 @@
 
 	def __init__(self, f):
 		if type(f) == type(''):
-			import builtin
-			f = builtin.open(f, 'r')
+			import __builtin__
+			f = __builtin__.open(f, 'r')
 		self.initfp(f)
 
 	def __del__(self):
@@ -284,8 +284,8 @@
 
 	def __init__(self, f):
 		if type(f) == type(''):
-			import builtin
-			f = builtin.open(f, 'w')
+			import __builtin__
+			f = __builtin__.open(f, 'w')
 		self.initfp(f)
 
 	def __del__(self):