Index: bp-themes/bp-default/activity/index.php
===================================================================
--- bp-themes/bp-default/activity/index.php
+++ bp-themes/bp-default/activity/index.php
@@ -36,7 +36,7 @@ get_header( 'buddypress' ); ?>
 				<ul>
 					<?php do_action( 'bp_before_activity_type_tab_all' ); ?>
 
-					<li class="selected" id="activity-all"><a href="<?php echo trailingslashit( bp_get_root_domain() . '/' . bp_get_activity_slug() ); ?>" title="<?php _e( 'The public activity for everyone on this site.', 'buddypress' ); ?>"><?php printf( __( 'All Members <span>%s</span>', 'buddypress' ), bp_get_total_member_count() ); ?></a></li>
+					<li class="selected" id="activity-all"><a href="<?php bp_activity_directory_permalink(); ?>" title="<?php _e( 'The public activity for everyone on this site.', 'buddypress' ); ?>"><?php printf( __( 'All Members <span>%s</span>', 'buddypress' ), bp_get_total_member_count() ); ?></a></li>
 
 					<?php if ( is_user_logged_in() ) : ?>