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-rw-r--r--mod/file/thumbnail.php2
1 files changed, 1 insertions, 1 deletions
diff --git a/mod/file/thumbnail.php b/mod/file/thumbnail.php
index 35bf8c7f7..851f13a8f 100644
--- a/mod/file/thumbnail.php
+++ b/mod/file/thumbnail.php
@@ -46,7 +46,7 @@ if ($simpletype == "image") {
// caching images for 10 days
header("Content-type: $mime");
- header('Expires: ' . date('r',time() + 864000));
+ header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', strtotime("+10 days")), true);
header("Pragma: public", true);
header("Cache-Control: public", true);
header("Content-Length: " . strlen($contents));