diff --git src/bp-templates/bp-nouveau/includes/template-tags.php src/bp-templates/bp-nouveau/includes/template-tags.php
index 8662aa552..85418c448 100644
--- src/bp-templates/bp-nouveau/includes/template-tags.php
+++ src/bp-templates/bp-nouveau/includes/template-tags.php
@@ -1489,6 +1489,10 @@ function bp_nouveau_container_classes() {
 			}
 		}
 
+		if ( current_theme_supports( 'align-wide' ) ) {
+			$classes[] = 'alignwide';
+		}
+
 		$class = array_map( 'sanitize_html_class', $classes );
 
 		/**