diff --git a/entities.dtd b/entities.dtd
index 8d1f254..cf585a6 100644
--- a/entities.dtd
+++ b/entities.dtd
@@ -1,2 +1,2 @@
-<!ENTITY mm "<mm_entity/>" >
-<!ENTITY oe "<oe_entity/>" >
\ No newline at end of file
+<!ENTITY mm "__m~__" >
+<!ENTITY oe "__oe__" >
\ No newline at end of file