diff --git a/demo/_curses.py b/demo/_curses.py
index 46443c24..d5e993f4 100644
--- a/demo/_curses.py
+++ b/demo/_curses.py
@@ -5,6 +5,11 @@
 
 from _curses_cffi import ffi, lib
 
+try:
+    unicode
+except NameError:
+    unicode = str
+
 
 def _copy_to_globals(name):
     globals()[name] = getattr(lib, name)
diff --git a/demo/bsdopendirtype.py b/demo/bsdopendirtype.py
index 75a996a2..283e33dc 100644
--- a/demo/bsdopendirtype.py
+++ b/demo/bsdopendirtype.py
@@ -1,3 +1,4 @@
+import os
 from _bsdopendirtype import ffi, lib
 
 
diff --git a/demo/recopendirtype.py b/demo/recopendirtype.py
index 768318bd..e22f92e9 100644
--- a/demo/recopendirtype.py
+++ b/demo/recopendirtype.py
@@ -1,3 +1,4 @@
+import os
 from _recopendirtype import ffi, lib