diff --git a/ui/jquery.ui.autocomplete.js b/ui/jquery.ui.autocomplete.js
index 27d9ee7d6..26dc0895c 100644
--- a/ui/jquery.ui.autocomplete.js
+++ b/ui/jquery.ui.autocomplete.js
@@ -235,6 +235,7 @@ $.widget("ui.autocomplete", {
 					}
 				}
 			})
+			.zIndex(this.element.zIndex() + 1)
 			// workaround for jQuery bug #5781 http://dev.jquery.com/ticket/5781
 			.css({ top: 0, left: 0 })
 			.position({