diff --git a/lib/private/Files/Type/Detection.php b/lib/private/Files/Type/Detection.php
index 35fec9c230f16..e16cfa52d728c 100644
--- a/lib/private/Files/Type/Detection.php
+++ b/lib/private/Files/Type/Detection.php
@@ -9,6 +9,7 @@
 
 namespace OC\Files\Type;
 
+use finfo;
 use OCP\Files\IMimeTypeDetector;
 use OCP\IBinaryFinder;
 use OCP\ITempManager;
diff --git a/tests/lib/Files/Type/DetectionTest.php b/tests/lib/Files/Type/DetectionTest.php
index 3d555fbcef46c..84d3ff4d164f8 100644
--- a/tests/lib/Files/Type/DetectionTest.php
+++ b/tests/lib/Files/Type/DetectionTest.php
@@ -103,6 +103,11 @@ public function testDetectString(): void {
 		$this->assertEquals($expected, $result);
 	}
 
+	public function testDetectStringIcon(): void {
+		$result = $this->detection->detectString(file_get_contents(\OC::$SERVERROOT . '/tests/data/media/image.ico'));
+		$this->assertEquals('image/vnd.microsoft.icon', $result);
+	}
+
 	public static function dataMimeTypeCustom(): array {
 		return [
 			['123', 'foobar/123'],