Index: install.php
===================================================================
--- install.php	(revision 53455)
+++ install.php	(working copy)
@@ -196,7 +196,7 @@
 						do_action( 'blog_privacy_selector' );
 					} else {
 						?>
-						<label for="blog_public"><input name="blog_public" type="checkbox" id="blog_public" value="0" <?php checked( 0, $blog_public ); ?> />
+						<label for="blog_public"><input name="blog_public" type="checkbox" id="blog_public" value="0" <?php if( isset( $_POST['blog_public'] ) && $blog_public ) echo 'checked="checked"'; ?> />
 						<?php _e( 'Discourage search engines from indexing this site' ); ?></label>
 						<p class="description"><?php _e( 'It is up to search engines to honor this request.' ); ?></p>
 					<?php } ?>