diff --git a/tika-server/tika-server-core/src/main/java/org/apache/tika/server/core/resource/TikaResource.java b/tika-server/tika-server-core/src/main/java/org/apache/tika/server/core/resource/TikaResource.java
index 868af43dcd..6332d32512 100644
--- a/tika-server/tika-server-core/src/main/java/org/apache/tika/server/core/resource/TikaResource.java
+++ b/tika-server/tika-server-core/src/main/java/org/apache/tika/server/core/resource/TikaResource.java
@@ -676,6 +676,7 @@ private StreamingOutput produceOutput(final InputStream is, Metadata metadata,
                 handler.getTransformer().setOutputProperty(OutputKeys.METHOD, format);
                 handler.getTransformer().setOutputProperty(OutputKeys.INDENT, "yes");
                 handler.getTransformer().setOutputProperty(OutputKeys.ENCODING, UTF_8.name());
+                handler.getTransformer().setOutputProperty(OutputKeys.VERSION, "1.1");
                 handler.setResult(new StreamResult(writer));
                 content = new ExpandedTitleContentHandler(handler);
             } catch (TransformerConfigurationException e) {