diff --git a/debian/changelog b/debian/changelog
index 5caddff..a82f9a0 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -4,6 +4,7 @@ gfxboot-theme-ubuntu (0.1.6) UNRELEASED; urgency=low
     were scary-looking anyway (closes: Ubuntu #21210).
   * Add Galician translation (thanks, Pedro Silva; closes: Ubuntu #21806).
   * Consider bit depth while sorting video modes.
+  * Remove duplicates from video mode list (closes: Ubuntu #21578).
 
  -- Colin Watson <cjwatson@ubuntu.com>  Wed, 11 Jan 2006 11:47:56 +0000
 
diff --git a/dia_video.inc b/dia_video.inc
index d00da31..d2f6cff 100644
--- a/dia_video.inc
+++ b/dia_video.inc
@@ -89,6 +89,26 @@
     } for
   } if
 
+  % uniquify video.modes.list
+
+  video.modes.list length 1 gt {
+    /video.modes.list [
+      video.modes.list 0 get
+      1 1 video.modes.list length 1 sub {
+        video.modes.list over 1 sub get
+        video.modes.list 2 index get
+
+        over .vm_width get over .vm_width get ne
+        2 index .vm_height get 2 index .vm_height get ne or
+        rot .vm_depth get rot .vm_depth get ne or {
+          video.modes.list exch get
+        } {
+          pop
+        } ifelse
+      } for
+    ] def
+  } if
+
   % create mode strings
 
   /video.modes.text [