diff --git a/openerp/addons/base/ir/ir_model.py b/openerp/addons/base/ir/ir_model.py
index e8ce3adb592..fdce0d7c483 100644
--- a/openerp/addons/base/ir/ir_model.py
+++ b/openerp/addons/base/ir/ir_model.py
@@ -35,12 +35,14 @@ import pooler
 _logger = logging.getLogger(__name__)
 
 def _get_fields_type(self, cr, uid, context=None):
+    # Avoid too many nested `if`s below, as RedHat's Python 2.6
+    # break on it. See bug 939653.  
     return sorted([(k,k) for k,v in fields.__dict__.iteritems()
-                      if type(v) == types.TypeType
-                      if issubclass(v, fields._column)
-                      if v != fields._column
-                      if not v._deprecated
-                      if not issubclass(v, fields.function)])
+                      if type(v) == types.TypeType and \
+                         issubclass(v, fields._column) and \
+                         v != fields._column and \
+                         not v._deprecated and \
+                         not issubclass(v, fields.function)])
 
 def _in_modules(self, cr, uid, ids, field_name, arg, context=None):
     #pseudo-method used by fields.function in ir.model/ir.model.fields