diff --git a/AppKit/CPTextView/CPTypesetter.j b/AppKit/CPTextView/CPTypesetter.j
index 8dd83c168..11b623f41 100755
--- a/AppKit/CPTextView/CPTypesetter.j
+++ b/AppKit/CPTextView/CPTypesetter.j
@@ -56,7 +56,7 @@ function _widthOfStringForFont(aString, aFont)
         var teststring = "0123456879abcdefghiklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ,.-()";
         _didTestCanvasSizingValid = YES;
         _measuringContext.font = [aFont cssString];
-        _isCanvasSizingInvalid = parseInt([teststring sizeWithFont:aFont].width) != parseInt(_measuringContext.measureText(teststring).width);
+        _isCanvasSizingInvalid = Math.round([teststring sizeWithFont:aFont].width) != Math.round(_measuringContext.measureText(teststring).width);
     }
 
     if (!CPFeatureIsCompatible(CPHTMLCanvasFeature) || _isCanvasSizingInvalid)  // measuring with canvas is _much_ faster on chrome