diff --git a/src/ol/control/Zoom.js b/src/ol/control/Zoom.js
index 4c0ef1fdae..553bf2188d 100644
--- a/src/ol/control/Zoom.js
+++ b/src/ol/control/Zoom.js
@@ -118,5 +118,5 @@ ol.control.Zoom.RES = {
     IN_CLS: 'ol-control-zoom-in',
     OUT_CLS: 'ol-control-zoom-out',
     IN_TEXT: '+',
-    OUT_TEXT: '−'
+    OUT_TEXT: '\u2212'
 };