diff --git a/lib/codemirror.js b/lib/codemirror.js
index 8ab124f6f9947b35ef19a4dd0d79f6f376df2ddc..bcabff735cdbe574660258e3a0740be20e4331fa 100644
--- a/lib/codemirror.js
+++ b/lib/codemirror.js
@@ -2966,7 +2966,7 @@ window.CodeMirror = (function() {
     }
   }
   function removeMarkedSpan(spans, span) {
-    for (var r, i = 0; i < spans.lenght; ++i)
+    for (var r, i = 0; i < spans.length; ++i)
       if (spans[i] == span) (r || (r = [])).push(spans[i]);
     return r;
   }