diff --git a/inc/Service/Media/MediaHandler.php b/inc/Service/Media/MediaHandler.php
index e0ac04fd..cf5588df 100644
--- a/inc/Service/Media/MediaHandler.php
+++ b/inc/Service/Media/MediaHandler.php
@@ -53,10 +53,8 @@ interface MediaHandler {
 
 	public function installMediaAndGenerateThumb(
 		mixed $handle,
-		string $media_preferred_out_file_dir,
-		string $media_preferred_out_file_name,
-		string $thumb_preferred_out_file_dir,
-		string $thumb_preferred_out_file_name,
+		string $media_preferred_out_file_basepath,
+		string $preferred_out_file_basepath,
 		string $thumb_preferred_out_mime,
 		int $thumb_max_width,
 		int $thumb_max_height
@@ -66,8 +64,7 @@ interface MediaHandler {
 	 * Generates a thumbnail from the given file.
 	 *
 	 * @param mixed $handle An opaque handle obtained from {@link openHandle}.
-	 * @param string $preferred_out_file_dir
-	 * @param string $preferred_out_file_name
+	 * @param string $preferred_out_file_basepath Desired path of the output file, WITHOUT extension.
 	 * @param string $preferred_out_mime
 	 * @param int $max_width
 	 * @param int $max_height
@@ -76,8 +73,7 @@ interface MediaHandler {
 	 */
 	public function generateThumb(
 		mixed $handle,
-		string $preferred_out_file_dir,
-		string $preferred_out_file_name,
+		string $preferred_out_file_basepath,
 		string $preferred_out_mime,
 		int $max_width,
 		int $max_height