diff --git a/tests/unit/progressbar/progressbar_common.js b/tests/unit/progressbar/progressbar_common.js
index ceee3fbec..0768576f5 100644
--- a/tests/unit/progressbar/progressbar_common.js
+++ b/tests/unit/progressbar/progressbar_common.js
@@ -1,8 +1,8 @@
 TestHelpers.commonWidgetTests( "progressbar", {
 	defaults: {
 		disabled: false,
-		value: 0,
 		max: 100,
+		value: 0,
 
 		//callbacks
 		change: null,
diff --git a/tests/unit/progressbar/progressbar_core.js b/tests/unit/progressbar/progressbar_core.js
index 0a2ef895b..54a33cc9d 100644
--- a/tests/unit/progressbar/progressbar_core.js
+++ b/tests/unit/progressbar/progressbar_core.js
@@ -1,7 +1,7 @@
 module( "progressbar: core" );
 
 test( "accessibility", function() {
-	expect( 7 );
+	expect( 11 );
 	var element = $( "#progressbar" ).progressbar();
 
 	equal( element.attr( "role" ), "progressbar", "aria role" );
@@ -12,9 +12,17 @@ test( "accessibility", function() {
 	element.progressbar( "value", 77 );
 	equal( element.attr( "aria-valuenow" ), 77, "aria-valuenow" );
 
+	element.progressbar( "option", "max", 150 );
+	equal( element.attr( "aria-valuemax" ), 150, "aria-valuemax" );
+
 	element.progressbar( "disable" );
 	equal( element.attr( "aria-disabled" ), "true", "aria-disabled on" );
 
 	element.progressbar( "enable" );
 	equal( element.attr( "aria-disabled" ), "false", "aria-disabled off" );
+
+	element.progressbar( "option", "value", false );
+	equal( element.attr( "aria-valuemin" ), 0, "aria-valuemin" );
+	equal( element.attr( "aria-valuemax" ), 150, "aria-valuemax" );
+	strictEqual( element.attr( "aria-valuenow" ), undefined, "aria-valuenow initially" );
 });
diff --git a/ui/jquery.ui.progressbar.js b/ui/jquery.ui.progressbar.js
index 53c9508ed..348f1d061 100644
--- a/ui/jquery.ui.progressbar.js
+++ b/ui/jquery.ui.progressbar.js
@@ -33,10 +33,10 @@ $.widget( "ui.progressbar", {
 		this.element
 			.addClass( "ui-progressbar ui-widget ui-widget-content ui-corner-all" )
 			.attr({
+				// Only set static values, aria-valuenow and aria-valuemax are
+				// set inside _refreshValue()
 				role: "progressbar",
-				"aria-valuemin": this.min,
-				"aria-valuemax": this.options.max,
-				"aria-valuenow": this.options.value
+				"aria-valuemin": this.min
 			});
 
 		this.valueDiv = $( "<div class='ui-progressbar-value ui-widget-header ui-corner-left'></div>" )
@@ -126,7 +126,7 @@ $.widget( "ui.progressbar", {
 			.width( percentage.toFixed(0) + "%" );
 
 		if ( this.indeterminate ) {
-			this.element.removeAttr( "aria-valuemax" ).removeAttr( "aria-valuenow" );
+			this.element.removeAttr( "aria-valuenow" );
 			if ( !this.overlayDiv ) {
 				this.overlayDiv = $( "<div class='ui-progressbar-overlay'></div>" ).appendTo( this.valueDiv );
 			}