Index: bp-core/bp-core-templatetags.php
===================================================================
--- bp-core/bp-core-templatetags.php	(revision 1823)
+++ bp-core/bp-core-templatetags.php	(working copy)
@@ -1715,7 +1715,10 @@
 
 		if ( is_year() )		
 			$bp_classes[] = 'blog-year';
-		
+
+		if ( !bp_is_blog_page() )
+			$wp_classes = array();
+
 		return apply_filters( 'bp_get_the_body_class', array_merge( (array) $bp_classes, (array) $wp_classes ), $bp_classes, $wp_classes );
 	}
 	add_filter( 'body_class', 'bp_get_the_body_class' )