diff --git a/includes/installer/MysqlUpdater.php b/includes/installer/MysqlUpdater.php
index 39b8de03ecf..4adb92644b7 100644
--- a/includes/installer/MysqlUpdater.php
+++ b/includes/installer/MysqlUpdater.php
@@ -496,20 +496,6 @@ class MysqlUpdater extends DatabaseUpdater {
 		);
 	}
 
-	protected function doUpdateMimeMinorField() {
-		if ( $this->updateRowExists( 'mime_minor_length' ) ) {
-			$this->output( "...*_mime_minor fields are already long enough.\n" );
-
-			return;
-		}
-
-		$this->applyPatch(
-			'patch-mime_minor_length.sql',
-			false,
-			'Altering all *_mime_minor fields to 100 bytes in size'
-		);
-	}
-
 	protected function doClFieldsUpdate() {
 		if ( $this->updateRowExists( 'cl_fields_update' ) ) {
 			$this->output( "...categorylinks up-to-date.\n" );
diff --git a/maintenance/archives/patch-mime_minor_length.sql b/maintenance/archives/patch-mime_minor_length.sql
deleted file mode 100644
index 88dd64cf79c..00000000000
--- a/maintenance/archives/patch-mime_minor_length.sql
+++ /dev/null
@@ -1,10 +0,0 @@
-ALTER TABLE /*_*/filearchive
-  MODIFY COLUMN fa_minor_mime varbinary(100) default "unknown";
-
-ALTER TABLE /*_*/image
-  MODIFY COLUMN img_minor_mime varbinary(100) NOT NULL default "unknown";
-
-ALTER TABLE /*_*/oldimage
-  MODIFY COLUMN oi_minor_mime varbinary(100) NOT NULL default "unknown";
-
-INSERT INTO /*_*/updatelog(ul_key) VALUES ('mime_minor_length');