diff --git a/spec/language-mode-spec.coffee b/spec/language-mode-spec.coffee
index adde464d0..5d0dc842e 100644
--- a/spec/language-mode-spec.coffee
+++ b/spec/language-mode-spec.coffee
@@ -36,6 +36,10 @@ describe "LanguageMode", ->
         languageMode.toggleLineCommentsForBufferRows(0, 0)
         expect(buffer.lineForRow(0)).toBe "\t// var i;"
 
+        buffer.setText('var i;')
+        languageMode.toggleLineCommentsForBufferRows(0, 0)
+        expect(buffer.lineForRow(0)).toBe "// var i;"
+
     describe "fold suggestion", ->
       describe ".doesBufferRowStartFold(bufferRow)", ->
         it "returns true only when the buffer row starts a foldable region", ->