diff --git a/semanticviews.module b/semanticviews.module
index 472ab09d0afafe4e28edfb578050f295f90ee5a2..93c7c2c096d03edcc99046f00c4a5b12922fb99e 100644
--- a/semanticviews.module
+++ b/semanticviews.module
@@ -74,9 +74,17 @@ function template_preprocess_semanticviews_view_unformatted(&$variables) {
     if ($id == 0 && $variables['options']['row']['first_class']) {
       $classes[] = $variables['options']['row']['first_class'];
     }
-    if (($last_every_nth && ($id + 1) % $last_every_nth == 0) || 
-       (!$last_every_nth && ($id + 1) == count($variables['rows']))) {
-      $classes[] = $variables['options']['row']['last_class'];
+    if ($variables['options']['row']['last_class']) {
+      // The LAST class attribute can be used in two ways. When the "last every
+      // nth" option is specified, the last attribute is added to the class in
+      // those intervals. This could be useful for grid designs where the last
+      // unit in a row needs a zero width margin.
+      if (($last_every_nth && ($id + 1) % $last_every_nth == 0) ||
+         // Otherwise when last every nth is not set, the LAST class is added
+         // to the last row in the row set.
+         (!$last_every_nth && ($id + 1) == count($variables['rows']))) {
+        $classes[] = $variables['options']['row']['last_class'];
+      }
     }
     // TODO: implement configurable row striping
     //$classes[] = $id % 2 ? 'even' : 'odd';