diff --git a/shacl_ast/src/ast/component.rs b/shacl_ast/src/ast/component.rs
index 1391bcf1..21cf239f 100644
--- a/shacl_ast/src/ast/component.rs
+++ b/shacl_ast/src/ast/component.rs
@@ -124,8 +124,8 @@ impl Component {
                 }
             }
             Self::UniqueLang(value) => {
-                Self::write_literal(
-                    &Literal::BooleanLiteral(*value),
+                Self::write_boolean(
+                    *value,
                     SH_UNIQUE_LANG_STR,
                     rdf_node,
                     rdf,
@@ -175,8 +175,8 @@ impl Component {
                 is_closed,
                 ignored_properties,
             } => {
-                Self::write_literal(
-                    &Literal::BooleanLiteral(*is_closed),
+                Self::write_boolean(
+                    *is_closed,
                     SH_CLOSED_STR,
                     rdf_node,
                     rdf,
@@ -235,8 +235,8 @@ impl Component {
                 }
 
                 if let Some(value) = qualified_value_shapes_disjoint {
-                    Self::write_literal(
-                        &Literal::BooleanLiteral(*value),
+                    Self::write_boolean(
+                        *value,
                         SH_QUALIFIED_MAX_COUNT_STR,
                         rdf_node,
                         rdf,
@@ -266,6 +266,20 @@ impl Component {
         Self::write_term(&RDF::term_s2term(&term), predicate, rdf_node, rdf)
     }
 
+    fn write_boolean<RDF>(
+        value: bool,
+        predicate: &str,
+        rdf_node: &RDFNode,
+        rdf: &mut RDF,
+    ) -> Result<(), RDF::Err>
+        where
+          RDF: SRDFBuilder,
+    {
+        let term = OxTerm::Literal(OxLiteral::from(value));
+
+        Self::write_term(&RDF::term_s2term(&term), predicate, rdf_node, rdf)
+    }
+
     fn write_literal<RDF>(
         value: &Literal,
         predicate: &str,
diff --git a/shacl_ast/src/ast/node_shape.rs b/shacl_ast/src/ast/node_shape.rs
index 75f2b130..697145c7 100644
--- a/shacl_ast/src/ast/node_shape.rs
+++ b/shacl_ast/src/ast/node_shape.rs
@@ -1,8 +1,4 @@
-use crate::{
-    component::Component, message_map::MessageMap, severity::Severity, target::Target,
-    SH_DEACTIVATED_STR, SH_DESCRIPTION_STR, SH_GROUP_STR, SH_INFO_STR, SH_NAME_STR, SH_NODE_SHAPE,
-    SH_PROPERTY_STR, SH_SEVERITY_STR, SH_VIOLATION_STR, SH_WARNING_STR,
-};
+use crate::{component::Component, message_map::MessageMap, severity::Severity, target::Target, SH_DEACTIVATED_STR, SH_DESCRIPTION_STR, SH_GROUP_STR, SH_INFO_STR, SH_NAME_STR, SH_NODE_SHAPE, SH_PROPERTY_STR, SH_SEVERITY_STR, SH_VIOLATION_STR, SH_WARNING_STR, SH_CLOSED_STR};
 use iri_s::iri;
 use oxrdf::{Literal as OxLiteral, Term as OxTerm};
 use srdf::{RDFNode, SRDFBuilder};
@@ -143,6 +139,16 @@ impl NodeShape {
             )?;
         }
 
+        if self.closed {
+            let term = OxTerm::Literal(OxLiteral::from(true));
+
+            rdf.add_triple(
+                &RDF::object_as_subject(&self.id).unwrap(),
+                &RDF::iri_s2iri(&iri!(SH_CLOSED_STR)),
+                &RDF::term_s2term(&term),
+            )?;
+        }
+
         Ok(())
     }
 }