diff --git a/validator/src/main/java/org/mustangproject/validator/ZUGFeRDValidator.java b/validator/src/main/java/org/mustangproject/validator/ZUGFeRDValidator.java
index 981d732f..d87eb83f 100644
--- a/validator/src/main/java/org/mustangproject/validator/ZUGFeRDValidator.java
+++ b/validator/src/main/java/org/mustangproject/validator/ZUGFeRDValidator.java
@@ -322,6 +322,7 @@ public class ZUGFeRDValidator {
 			}
 		} catch (IrrecoverableValidationError | IOException irx) {
 			LOGGER.info(irx.getMessage());
+			context.setInvalid ();
 		} finally {
 			finalStringResult.append(context.getXMLResult());
 			finalStringResult.append("</validation>");