diff --git a/src/text-editor-presenter.coffee b/src/text-editor-presenter.coffee
index 07499c822..814a2d220 100644
--- a/src/text-editor-presenter.coffee
+++ b/src/text-editor-presenter.coffee
@@ -466,7 +466,7 @@ class TextEditorPresenter
       if overlayDimensions = @overlayDimensions[decoration.id]
         {itemWidth, itemHeight, contentMargin} = overlayDimensions
 
-        if !stable
+        if not stable
 
           rightDiff = left + itemWidth + contentMargin - @windowWidth
           left -= rightDiff if rightDiff > 0