diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/graph/Constants.java b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/graph/Constants.java
index 58569e666..5f614c0a5 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/graph/Constants.java
+++ b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/dump/graph/Constants.java
@@ -23,7 +23,7 @@ public class Constants implements Serializable {
 	public static final String PROJECT_ENTITY = "project";
 
 	public static final String CONTEXT_ID = "00";
-	public static final String CONTEXT_NS_PREFIX = "context____";
+	public static final String CONTEXT_NS_PREFIX = "context_____";
 
 	// public static final String FUNDER_DS = "entityregistry::projects";
 }