diff --git a/readme.txt b/readme.txt
index 9be832562fa..6667a45274d 100644
--- a/readme.txt
+++ b/readme.txt
@@ -171,6 +171,7 @@ Yes you can! Join in on our [GitHub repository](http://github.com/woothemes/wooc
 * Fix - Payment method animation on the checkout.
 * Fix - Updated chosen library.
 * Fix - Saving of attributes/variations with custom product-level attributes.
+* Fix - Include once to prevent class exist errors with widgets.
 
 = 2.0.1 - 04/03/2013 =
 * Fix - Added an extra permalink flush after upgrade to save needing to do it manually.
diff --git a/woocommerce.php b/woocommerce.php
index 3c221578937..2a7eb7d19f6 100644
--- a/woocommerce.php
+++ b/woocommerce.php
@@ -191,7 +191,7 @@ class Woocommerce {
 			$file = 'class-' . str_replace( '_', '-', $class ) . '.php';
 
 			if ( is_readable( $path . $file ) ) {
-				include( $path . $file );
+				include_once( $path . $file );
 				return;
 			}
 
@@ -201,7 +201,7 @@ class Woocommerce {
 			$file = 'class-' . str_replace( '_', '-', $class ) . '.php';
 
 			if ( is_readable( $path . $file ) ) {
-				include( $path . $file );
+				include_once( $path . $file );
 				return;
 			}
 
@@ -211,7 +211,7 @@ class Woocommerce {
 			$file = 'class-' . str_replace( '_', '-', $class ) . '.php';
 
 			if ( is_readable( $path . $file ) ) {
-				include( $path . $file );
+				include_once( $path . $file );
 				return;
 			}
 		}
@@ -222,7 +222,7 @@ class Woocommerce {
 			$file = 'class-' . str_replace( '_', '-', $class ) . '.php';
 
 			if ( is_readable( $path . $file ) ) {
-				include( $path . $file );
+				include_once( $path . $file );
 				return;
 			}
 		}
@@ -270,25 +270,25 @@ class Woocommerce {
 			$this->frontend_includes();
 
 		// Functions
-		include( 'woocommerce-core-functions.php' );					// Contains core functions for the front/back end
+		include_once( 'woocommerce-core-functions.php' );					// Contains core functions for the front/back end
 
 		// Include abstract classes
-		include( 'classes/abstracts/abstract-wc-product.php' );			// Products
-		include( 'classes/abstracts/abstract-wc-settings-api.php' );	// Settings API (for gateways, shipping, and integrations)
-		include( 'classes/abstracts/abstract-wc-shipping-method.php' );	// A Shipping method
-		include( 'classes/abstracts/abstract-wc-payment-gateway.php' ); // A Payment gateway
-		include( 'classes/abstracts/abstract-wc-integration.php' );		// An integration with a service
+		include_once( 'classes/abstracts/abstract-wc-product.php' );			// Products
+		include_once( 'classes/abstracts/abstract-wc-settings-api.php' );	// Settings API (for gateways, shipping, and integrations)
+		include_once( 'classes/abstracts/abstract-wc-shipping-method.php' );	// A Shipping method
+		include_once( 'classes/abstracts/abstract-wc-payment-gateway.php' ); // A Payment gateway
+		include_once( 'classes/abstracts/abstract-wc-integration.php' );		// An integration with a service
 
 		// Classes (used on all pages)
-		include( 'classes/class-wc-product-factory.php' );				// Product factory
-		include( 'classes/class-wc-countries.php' );					// Defines countries and states
-		include( 'classes/class-wc-integrations.php' );					// Loads integrations
+		include_once( 'classes/class-wc-product-factory.php' );				// Product factory
+		include_once( 'classes/class-wc-countries.php' );					// Defines countries and states
+		include_once( 'classes/class-wc-integrations.php' );					// Loads integrations
 
 		// Include Core Integrations - these are included sitewide
-		include( 'classes/integrations/google-analytics/class-wc-google-analytics.php' );
-		include( 'classes/integrations/sharethis/class-wc-sharethis.php' );
-		include( 'classes/integrations/shareyourcart/class-wc-shareyourcart.php' );
-		include( 'classes/integrations/sharedaddy/class-wc-sharedaddy.php' );
+		include_once( 'classes/integrations/google-analytics/class-wc-google-analytics.php' );
+		include_once( 'classes/integrations/sharethis/class-wc-sharethis.php' );
+		include_once( 'classes/integrations/shareyourcart/class-wc-shareyourcart.php' );
+		include_once( 'classes/integrations/sharedaddy/class-wc-sharedaddy.php' );
 	}
 
 
@@ -299,7 +299,7 @@ class Woocommerce {
 	 * @return void
 	 */
 	public function admin_includes() {
-		include( 'admin/woocommerce-admin-init.php' );			// Admin section
+		include_once( 'admin/woocommerce-admin-init.php' );			// Admin section
 	}
 
 
@@ -310,7 +310,7 @@ class Woocommerce {
 	 * @return void
 	 */
 	public function ajax_includes() {
-		include( 'woocommerce-ajax.php' );						// Ajax functions for admin and the front-end
+		include_once( 'woocommerce-ajax.php' );						// Ajax functions for admin and the front-end
 	}
 
 
@@ -322,17 +322,17 @@ class Woocommerce {
 	 */
 	public function frontend_includes() {
 		// Functions
-		include( 'woocommerce-hooks.php' );						// Template hooks used on the front-end
-		include( 'woocommerce-functions.php' );					// Contains functions for various front-end events
+		include_once( 'woocommerce-hooks.php' );						// Template hooks used on the front-end
+		include_once( 'woocommerce-functions.php' );					// Contains functions for various front-end events
 
 		// Classes
-		include( 'classes/class-wc-query.php' );				// The main store queries
-		include( 'classes/class-wc-cart.php' );					// The main cart class
-		include( 'classes/class-wc-tax.php' );					// Tax class
-		include( 'classes/class-wc-customer.php' ); 			// Customer class
-		include( 'classes/abstracts/abstract-wc-session.php' ); // Abstract for session implementations
-		include( 'classes/class-wc-session-handler.php' );   	// WC Session class
-		include( 'classes/class-wc-shortcodes.php' );			// Shortcodes class
+		include_once( 'classes/class-wc-query.php' );				// The main store queries
+		include_once( 'classes/class-wc-cart.php' );					// The main cart class
+		include_once( 'classes/class-wc-tax.php' );					// Tax class
+		include_once( 'classes/class-wc-customer.php' ); 			// Customer class
+		include_once( 'classes/abstracts/abstract-wc-session.php' ); // Abstract for session implementations
+		include_once( 'classes/class-wc-session-handler.php' );   	// WC Session class
+		include_once( 'classes/class-wc-shortcodes.php' );			// Shortcodes class
 	}
 
 
@@ -343,7 +343,7 @@ class Woocommerce {
 	 * @return void
 	 */
 	public function include_template_functions() {
-		include( 'woocommerce-template.php' );
+		include_once( 'woocommerce-template.php' );
 	}
 
 
@@ -389,22 +389,22 @@ class Woocommerce {
 	 */
 	function register_widgets() {
 		// Include - no need to use autoload as WP loads them anyway
-		include( 'classes/widgets/class-wc-widget-cart.php' );
-		include( 'classes/widgets/class-wc-widget-featured-products.php' );
-		include( 'classes/widgets/class-wc-widget-layered-nav.php' );
-		include( 'classes/widgets/class-wc-widget-layered-nav-filters.php' );
-		include( 'classes/widgets/class-wc-widget-price-filter.php' );
-		include( 'classes/widgets/class-wc-widget-product-categories.php' );
-		include( 'classes/widgets/class-wc-widget-product-search.php' );
-		include( 'classes/widgets/class-wc-widget-product-tag-cloud.php' );
-		include( 'classes/widgets/class-wc-widget-recent-products.php' );
-		include( 'classes/widgets/class-wc-widget-top-rated-products.php' );
-		include( 'classes/widgets/class-wc-widget-recent-reviews.php' );
-		include( 'classes/widgets/class-wc-widget-recently-viewed.php' );
-		include( 'classes/widgets/class-wc-widget-best-sellers.php' );
-		include( 'classes/widgets/class-wc-widget-onsale.php' );
-		include( 'classes/widgets/class-wc-widget-login.php' );
-		include( 'classes/widgets/class-wc-widget-random-products.php' );
+		include_once( 'classes/widgets/class-wc-widget-cart.php' );
+		include_once( 'classes/widgets/class-wc-widget-featured-products.php' );
+		include_once( 'classes/widgets/class-wc-widget-layered-nav.php' );
+		include_once( 'classes/widgets/class-wc-widget-layered-nav-filters.php' );
+		include_once( 'classes/widgets/class-wc-widget-price-filter.php' );
+		include_once( 'classes/widgets/class-wc-widget-product-categories.php' );
+		include_once( 'classes/widgets/class-wc-widget-product-search.php' );
+		include_once( 'classes/widgets/class-wc-widget-product-tag-cloud.php' );
+		include_once( 'classes/widgets/class-wc-widget-recent-products.php' );
+		include_once( 'classes/widgets/class-wc-widget-top-rated-products.php' );
+		include_once( 'classes/widgets/class-wc-widget-recent-reviews.php' );
+		include_once( 'classes/widgets/class-wc-widget-recently-viewed.php' );
+		include_once( 'classes/widgets/class-wc-widget-best-sellers.php' );
+		include_once( 'classes/widgets/class-wc-widget-onsale.php' );
+		include_once( 'classes/widgets/class-wc-widget-login.php' );
+		include_once( 'classes/widgets/class-wc-widget-random-products.php' );
 
 		// Register widgets
 		register_widget( 'WC_Widget_Recent_Products' );
@@ -1983,4 +1983,4 @@ class Woocommerce {
  */
 $GLOBALS['woocommerce'] = new Woocommerce();
 
-} // class_exists check
+} // class_exists check
\ No newline at end of file