diff --git a/cd/__init__.py b/cd/__init__.py
index 9b1fdd9..4795a81 100644
--- a/cd/__init__.py
+++ b/cd/__init__.py
@@ -4,7 +4,7 @@ COMMANDS_PREFIX = 'cd-'
 
 
 def cd_list_environment():
-    for variable, value in os.environ:
+    for variable, value in os.environ.items():
         print(variable, value)