diff --git a/src/main/java/net/sourceforge/plantuml/servlet/DiagramResponse.java b/src/main/java/net/sourceforge/plantuml/servlet/DiagramResponse.java
index 6f19de1..e290ec2 100644
--- a/src/main/java/net/sourceforge/plantuml/servlet/DiagramResponse.java
+++ b/src/main/java/net/sourceforge/plantuml/servlet/DiagramResponse.java
@@ -77,6 +77,7 @@ class DiagramResponse {
     }
 
     void sendDiagram(String uml, int idx) throws IOException {
+        response.addHeader("Access-Control-Allow-Origin", "*");
         response.setContentType(getContentType());
         SourceStringReader reader = new SourceStringReader(uml);
         if (format == FileFormat.BASE64) {