diff --git a/src/spdx/writer/rdf/package_writer.py b/src/spdx/writer/rdf/package_writer.py
index 37f963f91..602c6992b 100644
--- a/src/spdx/writer/rdf/package_writer.py
+++ b/src/spdx/writer/rdf/package_writer.py
@@ -54,7 +54,7 @@ def add_package_to_graph(package: Package, graph: Graph, doc_namespace: str,
     add_optional_literal(package.description, graph, package_resource, SPDX_NAMESPACE.description)
     add_optional_literal(package.comment, graph, package_resource, RDFS.comment)
     for external_reference in package.external_references:
-        add_external_package_ref_to_graph(external_reference, graph, package_resource)
+        add_external_package_ref_to_graph(external_reference, graph, package_resource, doc_namespace)
     for attribution_text in package.attribution_texts:
         add_optional_literal(attribution_text, graph, package_resource, SPDX_NAMESPACE.attributionText)
     if package.primary_package_purpose:
@@ -81,7 +81,8 @@ def add_package_verification_code_to_graph(package_verification_code: PackageVer
     graph.add((package_node, SPDX_NAMESPACE.packageVerificationCode, package_verification_code_node))
 
 
-def add_external_package_ref_to_graph(external_package_ref: ExternalPackageRef, graph: Graph, package_node: URIRef):
+def add_external_package_ref_to_graph(external_package_ref: ExternalPackageRef, graph: Graph, package_node: URIRef,
+                                      doc_namespace: str):
     external_package_ref_node = BNode()
     graph.add((external_package_ref_node, RDF.type, SPDX_NAMESPACE.ExternalRef))
     graph.add((external_package_ref_node, SPDX_NAMESPACE.referenceCategory,
@@ -92,7 +93,7 @@ def add_external_package_ref_to_graph(external_package_ref: ExternalPackageRef,
                    REFERENCE_NAMESPACE[external_package_ref.reference_type]))
     else:
         graph.add((external_package_ref_node, SPDX_NAMESPACE.referenceType,
-                   URIRef(external_package_ref.reference_type)))
+                   URIRef(f"{doc_namespace}#{external_package_ref.reference_type}")))
     graph.add((external_package_ref_node, SPDX_NAMESPACE.referenceLocator, Literal(external_package_ref.locator)))
     if external_package_ref.comment:
         graph.add((external_package_ref_node, RDFS.comment, Literal(external_package_ref.comment)))
diff --git a/tests/spdx/writer/rdf/test_package_writer.py b/tests/spdx/writer/rdf/test_package_writer.py
index 7d2bd20df..abec88493 100644
--- a/tests/spdx/writer/rdf/test_package_writer.py
+++ b/tests/spdx/writer/rdf/test_package_writer.py
@@ -8,7 +8,9 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+import pytest
 from rdflib import Graph, URIRef, RDF, Literal, XSD, RDFS, DOAP
+from spdx.model.package import ExternalPackageRefCategory
 
 from spdx.datetime_conversions import datetime_to_iso_string
 from spdx.writer.rdf.package_writer import add_package_to_graph, add_external_package_ref_to_graph, \
@@ -63,14 +65,22 @@ def test_add_package_verification_code_to_graph():
     assert (None, SPDX_NAMESPACE.packageVerificationCodeExcludedFile, Literal("./exclude.py")) in graph
 
 
-def test_external_package_ref_to_graph():
+@pytest.mark.parametrize("external_reference,ref_type,category",
+                         [(external_package_ref_fixture(), URIRef("http://spdx.org/rdf/references/maven-central"),
+                           SPDX_NAMESPACE.referenceCategory_packageManager),
+                          (external_package_ref_fixture(locator="acmecorp/acmenator/4.1.3-alpha",
+                                                        category=ExternalPackageRefCategory.OTHER,
+                                                        reference_type="LocationRef-acmeforge",
+                                                        comment="This is the external ref for Acme"),
+                           URIRef("https://some.namespace#LocationRef-acmeforge"),
+                           SPDX_NAMESPACE.referenceCategory_other)])
+def test_external_package_ref_to_graph(external_reference, ref_type, category):
     graph = Graph()
-    external_reference = external_package_ref_fixture()
-
-    add_external_package_ref_to_graph(external_reference, graph, URIRef("docNamespace"))
+    doc_namespace = "https://some.namespace"
+    add_external_package_ref_to_graph(external_reference, graph, URIRef("docNamespace"), doc_namespace)
 
     assert (None, RDF.type, SPDX_NAMESPACE.ExternalRef) in graph
-    assert (None, SPDX_NAMESPACE.referenceCategory, SPDX_NAMESPACE.referenceCategory_packageManager) in graph
-    assert (None, SPDX_NAMESPACE.referenceType, URIRef("http://spdx.org/rdf/references/maven-central")) in graph
-    assert (None, SPDX_NAMESPACE.referenceLocator, Literal("org.apache.tomcat:tomcat:9.0.0.M4")) in graph
-    assert (None, RDFS.comment, Literal("externalPackageRefComment")) in graph
+    assert (None, SPDX_NAMESPACE.referenceCategory, category) in graph
+    assert (None, SPDX_NAMESPACE.referenceType, ref_type) in graph
+    assert (None, SPDX_NAMESPACE.referenceLocator, Literal(external_reference.locator)) in graph
+    assert (None, RDFS.comment, Literal(external_reference.comment)) in graph