diff --git a/il2_commons/organization.py b/il2_commons/organization.py
index <HASH>..<HASH> 100644
--- a/il2_commons/organization.py
+++ b/il2_commons/organization.py
@@ -202,7 +202,10 @@ class AirForces(Values):
 
     @classmethod
     def get_squadron_prefixes(cls):
-        return map(lambda x: x.default_squadron_prefix, cls.iterconstants())
+        result = map(lambda x: x.default_squadron_prefix, cls.iterconstants())
+        if six.PY3:
+            result = list(result)
+        return result
 
     @classmethod
     def get_by_squadron_prefix(cls, prefix):
Fix py3 compatibility.