diff --git a/lib/yui/chooserdialogue/chooserdialogue.js b/lib/yui/chooserdialogue/chooserdialogue.js
index 45f09e60942..499b693e946 100644
--- a/lib/yui/chooserdialogue/chooserdialogue.js
+++ b/lib/yui/chooserdialogue/chooserdialogue.js
@@ -238,8 +238,7 @@ YUI.add('moodle-core-chooserdialogue', function(Y) {
             // new max-height
             var totalheight = newheight;
             newheight = newheight - (15 + 15 + 40 + 40);
-            dialogue.setStyle('max-height', newheight + 'px');
-            dialogue.setStyle('height', newheight + 'px');
+            dialogue.setStyle('maxHeight', newheight + 'px');
 
             // Re-calculate the location now that we've changed the size
             var dialoguetop = Math.max(12, ((winheight - totalheight) / 2)) + offsettop;