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-rw-r--r--lib/watermark.php1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/watermark.php b/lib/watermark.php
index 4aa719aea..ddc41a36b 100644
--- a/lib/watermark.php
+++ b/lib/watermark.php
@@ -30,6 +30,7 @@ function tp_watermark($thumbs) {
$user_stamp_base = tp_get_img_dir();
$user_stamp_base .= strtolower($viewer->name . "_" . $watermark_filename . "_stamp");
+ $user_stamp_base .= preg_replace("/[^\w-]+/", "-", $user_stamp_base);
if( !file_exists( $user_stamp_base . $ext )) { //create the watermark if it doesn't exist
$commands = array();