diff --git a/scm-webapp/src/main/java/sonia/scm/api/v2/resources/ContentResource.java b/scm-webapp/src/main/java/sonia/scm/api/v2/resources/ContentResource.java
index dc7c305823..99ed29e6f6 100644
--- a/scm-webapp/src/main/java/sonia/scm/api/v2/resources/ContentResource.java
+++ b/scm-webapp/src/main/java/sonia/scm/api/v2/resources/ContentResource.java
@@ -136,7 +136,7 @@ public class ContentResource {
   private void appendContentHeader(String path, byte[] head, Response.ResponseBuilder responseBuilder) {
     ContentType contentType = ContentTypes.detect(path, head);
     responseBuilder.header("Content-Type", contentType.getRaw());
-    contentType.getLanguage().ifPresent(language -> responseBuilder.header("Language", language));
+    contentType.getLanguage().ifPresent(language -> responseBuilder.header("X-Programming-Language", language));
   }
 
   private byte[] getHead(String revision, String path, RepositoryService repositoryService) throws IOException, PathNotFoundException, RevisionNotFoundException {