diff --git a/apps/workflowengine/js/filenameplugin.js b/apps/workflowengine/js/filenameplugin.js
index cc95f78abd..c493bb3bf6 100644
--- a/apps/workflowengine/js/filenameplugin.js
+++ b/apps/workflowengine/js/filenameplugin.js
@@ -47,7 +47,7 @@
 				return;
 			}
 
-			var placeholder = 'text/plain';
+			var placeholder = 'dummy.jpg';
 			if (check['operator'] === 'matches' || check['operator'] === '!matches') {
 				placeholder = '/^dummy-.+$/i';
 
@@ -75,4 +75,4 @@
 	};
 })();
 
-OC.Plugins.register('OCA.WorkflowEngine.CheckPlugins', OCA.WorkflowEngine.Plugins.FileNamePlugin);
+OC.Plugins.register('OCA.WorkflowEngine.CheckPlugins', OCA.WorkflowEngine.Plugins.FileNamePlugin);
\ No newline at end of file