diff --git a/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporterFromA3.java b/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporterFromA3.java
index e497f202..04bbb4cd 100644
--- a/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporterFromA3.java
+++ b/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRDExporterFromA3.java
@@ -78,7 +78,7 @@ import jakarta.activation.FileDataSource;
 
 public class ZUGFeRDExporterFromA3 extends XRExporter implements IZUGFeRDExporter {
 	
-	private static final String XML_DESCRIPTION = https://www.ferd-net.de/en/standards/zugferd/factur-x;
+	private static final String XML_DESCRIPTION = "https://www.ferd-net.de/en/standards/zugferd/factur-x";
 
 	private boolean isFacturX = true;