diff --git a/src/display/canvas.js b/src/display/canvas.js
index 4ef3307f1..ef987f919 100644
--- a/src/display/canvas.js
+++ b/src/display/canvas.js
@@ -1225,7 +1225,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
       }
 
       var name = fontObj.loadedName || 'sans-serif';
-      var bold = fontObj.black ? (fontObj.bold ? 'bolder' : 'bold') :
+      var bold = fontObj.black ? (fontObj.bold ? '900' : 'bold') :
                                  (fontObj.bold ? 'bold' : 'normal');
 
       var italic = fontObj.italic ? 'italic' : 'normal';