diff --git a/src/_h5ai/client/js/inc/ext/preview-img.js b/src/_h5ai/client/js/inc/ext/preview-img.js
index bce04108..2c89d02f 100644
--- a/src/_h5ai/client/js/inc/ext/preview-img.js
+++ b/src/_h5ai/client/js/inc/ext/preview-img.js
@@ -100,8 +100,8 @@ modulejs.define('ext/preview-img', ['_', '$', 'core/settings', 'core/resource',
 			var $img = $('<img/>')
 				.one('load', function () {
 
-					// callback($img);
-					setTimeout(function () { callback($img); }, 1000); // for testing
+					callback($img);
+					// setTimeout(function () { callback($img); }, 1000); // for testing
 				})
 				.attr('src', src);
 		},
diff --git a/src/_h5ai/client/js/inc/ext/preview-txt.js b/src/_h5ai/client/js/inc/ext/preview-txt.js
index 7f9ca4d2..27478b22 100644
--- a/src/_h5ai/client/js/inc/ext/preview-txt.js
+++ b/src/_h5ai/client/js/inc/ext/preview-txt.js
@@ -149,8 +149,8 @@ modulejs.define('ext/preview-txt', ['_', '$', 'core/settings', 'core/resource',
 				dataType: 'text',
 				success: function (content) {
 
-					// callback(content);
-					setTimeout(function () { callback(content); }, 1000); // for testing
+					callback(content);
+					// setTimeout(function () { callback(content); }, 1000); // for testing
 				},
 				error: function (jqXHR, textStatus, errorThrown) {