diff --git a/gitk b/gitk
index 38c2c81a79..b31d0b0a63 100755
--- a/gitk
+++ b/gitk
@@ -10340,7 +10340,7 @@ proc refill_reflist {} {
             }
         }
     }
-    set trackedremoterefs [lsort -index 0 $trackedremoterefs]
+    set trackedremoterefs [lsort -index 0 -unique $trackedremoterefs]
     set localrefs [lsort -index 0 $localrefs]
 
     foreach n [array names headids] {