diff --git a/inc/Service/Media/MediaHandler.php b/inc/Service/Media/MediaHandler.php
index cf5588df..d2c84262 100644
--- a/inc/Service/Media/MediaHandler.php
+++ b/inc/Service/Media/MediaHandler.php
@@ -55,7 +55,6 @@ interface MediaHandler {
 		mixed $handle,
 		string $media_preferred_out_file_basepath,
 		string $preferred_out_file_basepath,
-		string $thumb_preferred_out_mime,
 		int $thumb_max_width,
 		int $thumb_max_height
 	): MediaInstallResult;
@@ -65,7 +64,6 @@ interface MediaHandler {
 	 *
 	 * @param mixed $handle An opaque handle obtained from {@link openHandle}.
 	 * @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
 	 * @return ThumbGenerationResult
@@ -74,7 +72,6 @@ interface MediaHandler {
 	public function generateThumb(
 		mixed $handle,
 		string $preferred_out_file_basepath,
-		string $preferred_out_mime,
 		int $max_width,
 		int $max_height
 	): ThumbGenerationResult;