diff --git a/ui/jquery.ui.button.js b/ui/jquery.ui.button.js
index 0c72e9c4bb..89f6626f8f 100644
--- a/ui/jquery.ui.button.js
+++ b/ui/jquery.ui.button.js
@@ -344,7 +344,7 @@ $.widget( "ui.button", {
 				buttonClasses.push( multipleIcons ? "ui-button-icons-only" : "ui-button-icon-only" );
 
 				if ( !this.hasTitle ) {
-					buttonElement.attr( "title", buttonText );
+					buttonElement.attr( "title", $.trim( buttonText ) );
 				}
 			}
 		} else {