diff --git a/src/wp-admin/js/customize-controls.js b/src/wp-admin/js/customize-controls.js
index 83db9651ca..5990208b32 100644
--- a/src/wp-admin/js/customize-controls.js
+++ b/src/wp-admin/js/customize-controls.js
@@ -7635,20 +7635,23 @@
 
 		// Create Panels
 		$.each( api.settings.panels, function ( id, data ) {
-			var Constructor = api.panelConstructor[ data.type ] || api.Panel;
-			api.panel.add( new Constructor( id, data ) );
+			var Constructor = api.panelConstructor[ data.type ] || api.Panel, options;
+			options = _.extend( { params: data }, data ); // Inclusion of params alias is for back-compat for custom panels that expect to augment this property.
+			api.panel.add( new Constructor( id, options ) );
 		});
 
 		// Create Sections
 		$.each( api.settings.sections, function ( id, data ) {
-			var Constructor = api.sectionConstructor[ data.type ] || api.Section;
-			api.section.add( new Constructor( id, data ) );
+			var Constructor = api.sectionConstructor[ data.type ] || api.Section, options;
+			options = _.extend( { params: data }, data ); // Inclusion of params alias is for back-compat for custom sections that expect to augment this property.
+			api.section.add( new Constructor( id, options ) );
 		});
 
 		// Create Controls
 		$.each( api.settings.controls, function( id, data ) {
-			var Constructor = api.controlConstructor[ data.type ] || api.Control;
-			api.control.add( new Constructor( id, data ) );
+			var Constructor = api.controlConstructor[ data.type ] || api.Control, options;
+			options = _.extend( { params: data }, data ); // Inclusion of params alias is for back-compat for custom controls that expect to augment this property.
+			api.control.add( new Constructor( id, options ) );
 		});
 
 		// Focus the autofocused element