diff --git a/mode/meta.js b/mode/meta.js
index 8852e7cdeb787d620738a72aa2063a9532e23be5..3cb9de21e11edcfe684d4b5087b2bca019f4bc56 100644
--- a/mode/meta.js
+++ b/mode/meta.js
@@ -138,7 +138,7 @@
     {name: "Tiki wiki", mime: "text/tiki", mode: "tiki"},
     {name: "TOML", mime: "text/x-toml", mode: "toml", ext: ["toml"]},
     {name: "Tornado", mime: "text/x-tornado", mode: "tornado"},
-    {name: "troff", mime: "troff", mode: "troff", ext: ["1", "2", "3", "4", "5", "6", "7", "8", "9"]},
+    {name: "troff", mime: "text/troff", mode: "troff", ext: ["1", "2", "3", "4", "5", "6", "7", "8", "9"]},
     {name: "TTCN", mime: "text/x-ttcn", mode: "ttcn", ext: ["ttcn", "ttcn3", "ttcnpp"]},
     {name: "TTCN_CFG", mime: "text/x-ttcn-cfg", mode: "ttcn-cfg", ext: ["cfg"]},
     {name: "Turtle", mime: "text/turtle", mode: "turtle", ext: ["ttl"]},
diff --git a/mode/troff/troff.js b/mode/troff/troff.js
index 7e043a11f07b6f7ec83faf1349fe88d1b5e70b98..86154b6e14a8e7b9782f29eb6d80139ffdfe75ea 100644
--- a/mode/troff/troff.js
+++ b/mode/troff/troff.js
@@ -80,6 +80,5 @@ CodeMirror.defineMode('troff', function() {
 CodeMirror.defineMIME('text/troff', 'troff');
 CodeMirror.defineMIME('text/x-troff', 'troff');
 CodeMirror.defineMIME('application/x-troff', 'troff');
-CodeMirror.defineMIME('troff', 'troff');
 
 });