diff --git a/src/rougail/loader.py b/src/rougail/loader.py
index 4b17833a..46d5e1f2 100644
--- a/src/rougail/loader.py
+++ b/src/rougail/loader.py
@@ -21,9 +21,16 @@ from .i18n import _
 from .xmlreflector import HIGH_COMPATIBILITY
 #from . import eosfunc
 from .objspace import CreoleObjSpace
+from .utils import normalize_family
 import imp
 
 
+class ConvertDynOptionDescription(DynOptionDescription):
+    def convert_suffix_to_path(self, suffix):
+        return normalize_family(suffix,
+                                check=False)
+
+
 class CreoleLoaderError(Exception):
     pass
 
@@ -539,7 +546,7 @@ class Family(Common):
                     del self.attrib['dynamic']
                     self.attrib['suffixes'] = Calculation(self.eosfunc.calc_value,
                                                           Params((ParamOption(dynamic),)))
-                    option = DynOptionDescription(**self.attrib)
+                    option = ConvertDynOptionDescription(**self.attrib)
                 elif not self.is_leader:
                     option = OptionDescription(**self.attrib)
                 else: