diff --git a/lib/server-core-ext/src/main/java/org/apache/olingo/server/core/MetadataParser.java b/lib/server-core-ext/src/main/java/org/apache/olingo/server/core/MetadataParser.java
index 3023c4b0d5..d4f5d1c231 100644
--- a/lib/server-core-ext/src/main/java/org/apache/olingo/server/core/MetadataParser.java
+++ b/lib/server-core-ext/src/main/java/org/apache/olingo/server/core/MetadataParser.java
@@ -915,7 +915,7 @@ private CsdlNavigationProperty readNavigationProperty(XMLEventReader reader, Sta
     property.setName(attr(element, "Name"));
     property.setType(readType(element));
     property.setCollection(isCollectionType(element));
-    property.setNullable(Boolean.parseBoolean(attr(element, "Nullable")));
+    property.setNullable(Boolean.parseBoolean(attr(element, "Nullable") == null ? "true" : attr(element, "Nullable")));
     property.setPartner(attr(element, "Partner"));
     property.setContainsTarget(Boolean.parseBoolean(attr(element, "ContainsTarget")));