diff --git a/js/jquery.mobile.collapsible.js b/js/jquery.mobile.collapsible.js
index 33e8fd18..f3ed05e8 100644
--- a/js/jquery.mobile.collapsible.js
+++ b/js/jquery.mobile.collapsible.js
@@ -45,7 +45,7 @@ $.widget( "mobile.collapsible", $.mobile.widget, {
 			}
 		}
 
-		collapsibleContent.addClass( ( o.contentTheme ) ? ( "ui-btn-up-" + o.contentTheme ) : "");
+		collapsibleContent.addClass( ( o.contentTheme ) ? ( "ui-body-" + o.contentTheme ) : "");
 
 		collapsibleHeading
 			//drop heading in before content
@@ -61,7 +61,7 @@ $.widget( "mobile.collapsible", $.mobile.widget, {
 					iconPos: "left",
 					icon: "plus",
 					theme: o.theme
-				})
+				});
 
 		if ( !collapsibleSet.length ) {
 			collapsibleHeading
diff --git a/tests/unit/collapsible/collapsible_core.js b/tests/unit/collapsible/collapsible_core.js
index 48907752..d353e8ac 100644
--- a/tests/unit/collapsible/collapsible_core.js
+++ b/tests/unit/collapsible/collapsible_core.js
@@ -129,9 +129,9 @@
 				ok( collapsibles.eq(0).find( ".ui-collapsible-heading-toggle" ).hasClass( "ui-btn-up-a" ), "Heading of first collapsible should have class ui-btn-up-a");
 				ok( !collapsibles.eq(0).find( ".ui-collapsible-content" ).hasClass( "ui-btn-up-a" ), "Content of first collapsible should NOT have class ui-btn-up-a");
 				ok( collapsibles.eq(1).find( ".ui-collapsible-heading-toggle" ).hasClass( "ui-btn-up-b" ), "Heading of second collapsible should have class ui-btn-up-b");
-				ok( collapsibles.eq(1).find( ".ui-collapsible-content" ).hasClass( "ui-btn-up-b" ), "Content of second collapsible should have class ui-btn-up-b");
+				ok( collapsibles.eq(1).find( ".ui-collapsible-content" ).hasClass( "ui-body-b" ), "Content of second collapsible should have class ui-btn-up-b");
 				ok( collapsibles.eq(2).find( ".ui-collapsible-heading-toggle" ).hasClass( "ui-btn-up-c" ), "Heading of third collapsible should have class ui-btn-up-c");
-				ok( collapsibles.eq(2).find( ".ui-collapsible-content" ).hasClass( "ui-btn-up-c" ), "Content of third collapsible should have class ui-btn-up-c");
+				ok( collapsibles.eq(2).find( ".ui-collapsible-content" ).hasClass( "ui-body-c" ), "Content of third collapsible should have class ui-btn-up-c");
 				start();
 			}
 		]);
@@ -147,15 +147,15 @@
 			function() {
 				var collapsibles = $.mobile.activePage.find( ".ui-collapsible" );
 				ok( collapsibles.eq(0).find( ".ui-collapsible-heading-toggle" ).hasClass( "ui-btn-up-a" ), "Heading of first collapsible should have class ui-btn-up-a");
-				ok( !collapsibles.eq(0).find( ".ui-collapsible-content" ).hasClass( "ui-btn-up-a" ), "Content of first collapsible should NOT have class ui-btn-up-a");
-				ok( collapsibles.eq(0).find( ".ui-collapsible-content" ).hasClass( "ui-btn-up-d" ), "Content of first collapsible should NOT have class ui-btn-up-d");
+				ok( !collapsibles.eq(0).find( ".ui-collapsible-content" ).hasClass( "ui-body-a" ), "Content of first collapsible should NOT have class ui-btn-up-a");
+				ok( collapsibles.eq(0).find( ".ui-collapsible-content" ).hasClass( "ui-body-d" ), "Content of first collapsible should NOT have class ui-btn-up-d");
 				ok( collapsibles.eq(1).find( ".ui-collapsible-heading-toggle" ).hasClass( "ui-btn-up-b" ), "Heading of second collapsible should have class ui-btn-up-b");
-				ok( collapsibles.eq(1).find( ".ui-collapsible-content" ).hasClass( "ui-btn-up-b" ), "Content of second collapsible should have class ui-btn-up-b");
+				ok( collapsibles.eq(1).find( ".ui-collapsible-content" ).hasClass( "ui-body-b" ), "Content of second collapsible should have class ui-btn-up-b");
 				ok( collapsibles.eq(2).find( ".ui-collapsible-heading-toggle" ).hasClass( "ui-btn-up-d" ), "Heading of third collapsible should have class ui-btn-up-d");
-				ok( collapsibles.eq(2).find( ".ui-collapsible-content" ).hasClass( "ui-btn-up-d" ), "Content of third collapsible should have class ui-btn-up-d");
+				ok( collapsibles.eq(2).find( ".ui-collapsible-content" ).hasClass( "ui-body-d" ), "Content of third collapsible should have class ui-btn-up-d");
 				ok( !collapsibles.eq(2).find( ".ui-collapsible-content" ).hasClass( "ui-collapsible-content-collapsed" ), "Content of third collapsible should NOT have class ui-collapsible-content-collapsed");
 				ok( collapsibles.eq(3).find( ".ui-collapsible-heading-toggle" ).hasClass( "ui-btn-up-d" ), "Heading of fourth collapsible should have class ui-btn-up-d");
-				ok( collapsibles.eq(3).find( ".ui-collapsible-content" ).hasClass( "ui-btn-up-d" ), "Content of fourth collapsible should have class ui-btn-up-d");
+				ok( collapsibles.eq(3).find( ".ui-collapsible-content" ).hasClass( "ui-body-d" ), "Content of fourth collapsible should have class ui-btn-up-d");
 				start();
 			}
 		]);