diff --git a/functions.php b/functions.php
index 527f72d..a4afc77 100644
--- a/functions.php
+++ b/functions.php
@@ -256,7 +256,7 @@ function display_thumbnails($dir, $file_prefix, $title)
 	
 	$thumb_dir = "$dir/thumbnails";
 	if (! is_dir($thumb_dir)) {
-		if (! mkdir($thum_dir, 0775))
+		if (! mkdir($thumb_dir, 0775))
 			echo "<p>Unable to make '$thum_dir' directory. You will need to create it manually.</p>";
 			print_r(error_get_last());
 	}