diff --git a/shacl-diagram/src/main/java/fr/sparna/rdf/shacl/diagram/PlantUmlBox.java b/shacl-diagram/src/main/java/fr/sparna/rdf/shacl/diagram/PlantUmlBox.java
index 64790630..c978c003 100644
--- a/shacl-diagram/src/main/java/fr/sparna/rdf/shacl/diagram/PlantUmlBox.java
+++ b/shacl-diagram/src/main/java/fr/sparna/rdf/shacl/diagram/PlantUmlBox.java
@@ -92,7 +92,9 @@ public int countShNodeOrShClassReferencesTo(String id, PlantUmlDiagram diagram)
 	
 	public String getLabel() {
 		// use the sh:targetClass if present, otherwise use the URI of the NodeShape
-		return ModelRenderingUtils.render(this.nodeShape, true)+this.getTargetClass().map(targetClass -> " ("+ModelRenderingUtils.render(targetClass, true)+")").orElse("");
+		return this.getTargetClass()
+				.map(targetClass -> ModelRenderingUtils.render(targetClass, true))
+				.orElse(ModelRenderingUtils.render(this.nodeShape, true));
 	}
 	
 	public String getPlantUmlQuotedBoxName() {