diff --git a/js/script.js b/js/script.js
index 04878d2e9..06aebd909 100755
--- a/js/script.js
+++ b/js/script.js
@@ -253,7 +253,7 @@ $(function(){
 				for (var i = 0; i < activity.previews.length; i++) {
 					var preview = activity.previews[i];
 					content += ((preview.link) ? '<a href="' + preview.link + '">' + "\n" : '')
-						+ '<img class="preview' + ((preview.isMimeTypeIcon) ? ' preview-mimetype-icon' : '') + '" src="' + preview.source + '" alt="' + t('activity', 'Open file') + '" />' + "\n"
+						+ '<img class="preview' + ((preview.isMimeTypeIcon) ? ' preview-mimetype-icon' : '') + '" src="' + preview.source + '" alt="' + t('activity', 'Open {filename}', preview) + '" />' + "\n"
 						+ ((preview.link) ? '</a>' + "\n" : '')
 				}
 				content += '</div>';
diff --git a/lib/Controller/APIv2Controller.php b/lib/Controller/APIv2Controller.php
index faef30721..0fcb7171c 100644
--- a/lib/Controller/APIv2Controller.php
+++ b/lib/Controller/APIv2Controller.php
@@ -363,6 +363,7 @@ protected function getPreview(string $owner, int $fileId, string $filePath): arr
 			'isMimeTypeIcon' => true,
 			'fileId' => $fileId,
 			'view' => $info['view'] ?: 'files',
+			'filename' => basename($filePath),
 		];
 
 		// show a preview image if the file still exists
@@ -401,6 +402,7 @@ protected function getPreviewFromPath(int $fileId, string $filePath, array $info
 			'isMimeTypeIcon' => true,
 			'fileId' => $fileId,
 			'view' => $info['view'] ?: 'files',
+			'filename' => basename($filePath),
 		];
 	}
 
diff --git a/tests/Controller/APIv2ControllerTest.php b/tests/Controller/APIv2ControllerTest.php
index 40389f74f..cdb49053a 100644
--- a/tests/Controller/APIv2ControllerTest.php
+++ b/tests/Controller/APIv2ControllerTest.php
@@ -765,6 +765,7 @@ public function testGetPreview(string $author, int $fileId, string $path, string
 					'isMimeTypeIcon' => $isMimeTypeIcon,
 					'fileId' => $fileId,
 					'view' => 'files',
+					'filename' => basename($path),
 				]);
 		}
 
@@ -775,6 +776,7 @@ public function testGetPreview(string $author, int $fileId, string $path, string
 			'isMimeTypeIcon' => $isMimeTypeIcon,
 			'fileId' => $fileId,
 			'view' => 'files',
+			'filename' => basename($path),
 		], self::invokePrivate($controller, 'getPreview', [$author, $fileId, $path]));
 	}
 
@@ -820,6 +822,7 @@ public function testGetPreviewFromPath(int $fileId, string $filePath, string $mi
 				'isMimeTypeIcon' => true,
 				'fileId' => $fileId,
 				'view' => $view ?: 'files',
+				'filename' => basename($filePath),
 			],
 			self::invokePrivate($controller, 'getPreviewFromPath', [$fileId, $filePath, ['path' => $filePath, 'is_dir' => $isDir, 'view' => $view]])
 		);