diff --git a/share/completions/hg.fish b/share/completions/hg.fish
index cdbc0ef64..6227aa8f5 100644
--- a/share/completions/hg.fish
+++ b/share/completions/hg.fish
@@ -311,7 +311,7 @@ function __fish_hg_branches
 end
 
 function __fish_hg_merge_tools
-    for tool in internal:dump internal:fail internal:local internal:merge internal:merge-local internal:merge-other internal:merge3 internal:other internal:prompt internal:union
+    for tool in internal:dump internal:fail internal:forcedump internal:local internal:merge internal:merge-local internal:merge-other internal:merge3 internal:other internal:prompt internal:tagmerge internal:union
         printf "$tool\tmerge tool\n"
     end
     for line in (__fish_hg config merge-tools)