diff --git a/stream/exceptions.py b/stream/exceptions.py
index 58d8753..64b1c4b 100644
--- a/stream/exceptions.py
+++ b/stream/exceptions.py
@@ -86,5 +86,8 @@ def get_exceptions():
 
 def get_exception_dict():
     classes = get_exceptions()
-    exception_dict = {c.code: c for c in classes}
+    exception_dict = {}
+    for c in classes:
+        exception_dict[c.code] = c
+    # exception_dict = {c.code: c for c in classes}
     return exception_dict