diff --git a/ui/jquery.ui.dialog.js b/ui/jquery.ui.dialog.js
index f2e3f945f..c1ac7bc9e 100644
--- a/ui/jquery.ui.dialog.js
+++ b/ui/jquery.ui.dialog.js
@@ -509,9 +509,9 @@ $.widget("ui.dialog", {
 				});
 
 				position = {
-					my: myAt.join( " " ),
-					at: myAt.join( " " ),
-					offset: offset.join( " " )
+					my: myAt[0] + (offset[0] < 0 ? offset[0] : "+" + offset[0]) + " " +
+						myAt[1] + (offset[1] < 0 ? offset[1] : "+" + offset[1]),
+					at: myAt.join( " " )
 				};
 			}