diff --git a/mkdocs.yml b/mkdocs.yml
index 7afecd1..497eff3 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -25,7 +25,6 @@ nav:
     - Bardet_Biedl_Syndrome: kb/Bardet_Biedl_Syndrome.html
     - Crohn_Disease: kb/Crohn_Disease.html
     - Dengue: kb/Dengue.html
-    - Dengue: kb/Dengue.html.old
     - Ebola_Virus_Disease_EVD_: kb/Ebola_Virus_Disease_EVD_.html
     - Ehlers_Danlos_Syndrome: kb/Ehlers_Danlos_Syndrome.html
     - Ehlers_Danlos_Syndrome_COL5A1_related: kb/Ehlers_Danlos_Syndrome_COL5A1_related.html