diff --git a/.htaccess b/.htaccess
index 7fdf0a5a..8e33b6f3 100644
--- a/.htaccess
+++ b/.htaccess
@@ -48,9 +48,9 @@
 	AddOutputFilterByType DEFLATE application/x-javascript application/javascript
 </ifmodule>
 
-DefaultType image/jpeg
 AddType audio/mp4      f4a f4b m4a
 AddType audio/ogg      oga ogg opus
+AddType image/jpeg     jpg jpeg
 AddType image/bmp      bmp
 AddType image/svg+xml  svg svgz
 AddType image/webp     webp
diff --git a/ext/upload/main.php b/ext/upload/main.php
index da3d3430..524f751b 100644
--- a/ext/upload/main.php
+++ b/ext/upload/main.php
@@ -291,7 +291,7 @@ class Upload extends Extension {
 
 	/**
 	 * Handle an upload.
-	 * @param string $file
+	 * @param string[] $file
 	 * @param string[] $tags
 	 * @param string|null $source
 	 * @param int $replace
@@ -299,7 +299,7 @@ class Upload extends Extension {
 	 */
 	private function try_upload($file, $tags, $source, $replace=-1) {
 		global $page;
-		assert('is_string($file)');
+		assert('is_array($file)');
 		assert('is_array($tags)');
 		assert('is_string($source) || is_null($source)');
 		assert('is_int($replace)');