Index: post-template.php
===================================================================
--- post-template.php	(revision 4214)
+++ post-template.php	(working copy)
@@ -173,14 +173,14 @@
 					if ( '' == get_option('permalink_structure') )
 						$output .= '<a href="' . get_permalink() . '&amp;page=' . $i . '">'.$previouspagelink.'</a>';
 					else
-						$output .= '<a href="' . get_permalink() . $i . '/">'.$previouspagelink.'</a>';
+						$output .= '<a href="' . trailingslashit( get_permalink() ) . $i . '/">'.$previouspagelink.'</a>';
 				}
 				$i = $page + 1;
 				if ( $i <= $numpages && $more ) {
 					if ( '' == get_option('permalink_structure') )
 						$output .= '<a href="'.get_permalink() . '&amp;page=' . $i . '">'.$nextpagelink.'</a>';
 					else
-						$output .= '<a href="'.get_permalink().$i.'/">'.$nextpagelink.'</a>';
+						$output .= '<a href="'.trailingslashit( get_permalink() ).$i.'/">'.$nextpagelink.'</a>';
 				}
 				$output .= $after;
 			}