diff --git a/gz3d/build/gz3d.js b/gz3d/build/gz3d.js
index 774d3a3b734dd42214e54e56f0c8acb851ab852b..e2ba4b927caad2495483fa37034ae28e2251a0df 100644
--- a/gz3d/build/gz3d.js
+++ b/gz3d/build/gz3d.js
@@ -5278,7 +5278,7 @@ GZ3D.MultiView.prototype.createViewContainer = function(displayParams, name)
         return undefined;
     }
 
-    viewContainer.className += 'viewContainer';
+    viewContainer.className += (viewContainer.className.length > 0) ? ' viewContainer' : 'viewContainer';
 
     // z-index
     var zIndexTop = parseInt(this.mainContainer.style.zIndex, 10) + this.views.length + 1;