diff --git a/deegree-core/deegree-core-base/src/main/java/org/deegree/gml/feature/GMLFeatureWriter.java b/deegree-core/deegree-core-base/src/main/java/org/deegree/gml/feature/GMLFeatureWriter.java
index 2bdc28cc1b..f40b55748e 100644
--- a/deegree-core/deegree-core-base/src/main/java/org/deegree/gml/feature/GMLFeatureWriter.java
+++ b/deegree-core/deegree-core-base/src/main/java/org/deegree/gml/feature/GMLFeatureWriter.java
@@ -491,7 +491,7 @@ private void writeNilAttributes(Map<QName, PrimitiveValue> attributes) throws XM
 		writeAttributeWithNS(XSI_NIL.getNamespaceURI(), XSI_NIL.getLocalPart(), "true");
 		PrimitiveValue value = attributes.get(NIL_REASON);
 		if (value != null)
-			writeAttributeWithNS(NIL_REASON.getNamespaceURI(), NIL_REASON.getLocalPart(), "true");
+			writeAttributeWithNS(NIL_REASON.getNamespaceURI(), NIL_REASON.getLocalPart(), value.getAsText());
 	}
 
 	private boolean excludeByTimeSliceFilter(Property property) {