diff --git a/wani.py b/wani.py
index 2a62094..3fc185d 100644
--- a/wani.py
+++ b/wani.py
@@ -194,8 +194,11 @@ class LexisCR(ComponentRepresentation):
     
 class WordFormAllCR(ComponentRepresentation):
     def _render(self):
-        txt = "/".join(set([w.text for w in set(self.words)])) if len(self.words) > 0 else None
-        return txt
+        if len(self.words) == 0:
+            return None
+        else:
+            forms = [w.text.lower() for w in self.words]
+            return "/".join(set(forms))
 
 class WordFormAnyCR(ComponentRepresentation):
     def _render(self):