diff --git a/opennms-webapp/src/main/java/org/opennms/web/controller/admin/support/FormatterView.java b/opennms-webapp/src/main/java/org/opennms/web/controller/admin/support/FormatterView.java
index 1b2e3da65b8a..95c5306f7c78 100644
--- a/opennms-webapp/src/main/java/org/opennms/web/controller/admin/support/FormatterView.java
+++ b/opennms-webapp/src/main/java/org/opennms/web/controller/admin/support/FormatterView.java
@@ -120,7 +120,7 @@ public String getFileName(final HttpServletRequest request) {
         final String outputParameter = request.getParameter("output");
         String fileName = null;
         if (outputParameter != null && !outputParameter.matches("^[\\s]*$")) {
-            fileName = new File(outputParameter).getName().replaceAll("[^[:alnum:]\\.]", "");
+            fileName = new File(outputParameter).getName().replaceAll("[^\\w\\.]", "");
         } else {
             fileName = "opennms-system-report." + m_formatter.getExtension();
         }