diff --git a/tests/test_Layer_WMS.html b/tests/test_Layer_WMS.html
index d864b8e6c3..0cefe1558b 100644
--- a/tests/test_Layer_WMS.html
+++ b/tests/test_Layer_WMS.html
@@ -181,14 +181,14 @@
         map.addLayer(tLayer);
         map.zoomToMaxExtent();
         t.eq(tLayer.opacity, "0.5", "Opacity is set correctly");
-        t.eq(tLayer.div.firstChild.style.opacity, "0.5", "Opacity on tile is correct");
+        t.eq(parseFloat(tLayer.div.firstChild.style.opacity), 0.5, "Opacity on tile is correct");
         tLayer.setOpacity("0.6");
         t.eq(tLayer.opacity, "0.6", "setOpacity works properly");
-        t.eq(tLayer.div.firstChild.style.opacity, "0.6", "Opacity on tile is changed correctly");
+        t.eq(parseFloat(tLayer.div.firstChild.style.opacity), 0.6, "Opacity on tile is changed correctly");
         var pixel = new OpenLayers.Pixel(5,6);
         var tile = tLayer.addTile(new OpenLayers.Bounds(1,2,3,4), pixel);
         tile.draw();
-        t.eq(tile.imgDiv.style.opacity, "0.6", "Tile opacity is set correctly");
+        t.eq(parseFloat(tile.imgDiv.style.opacity), 0.6, "Tile opacity is set correctly");
 
     }