1 files changed, 1 insertions, 1 deletions
diff --git a/lib/private/Preview/Illustrator.php b/lib/private/Preview/Illustrator.php
index 733b679f3f5..b8f29d4754f 100644
--- a/lib/private/Preview/Illustrator.php
+++ b/lib/private/Preview/Illustrator.php
@@ -28,7 +28,7 @@ class Illustrator extends Bitmap {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/application\/illustrator/';
 	}
 }