diff --git a/pkg_api/core/namespaces.py b/pkg_api/core/namespaces.py
index d5c29f6..93d65b7 100644
--- a/pkg_api/core/namespaces.py
+++ b/pkg_api/core/namespaces.py
@@ -15,7 +15,7 @@ class PKGPrefixes(Enum):
     DCAT = "http://www.w3.org/ns/dcat#"
     DOAP = "http://usefulinc.com/ns/doap#"
     EVENT = "http://purl.org/NET/c4dm/event.owl#"
-    EX = "http://example.com#"
+    EX = "http://example.org/pkg#"
     FOAF = "http://xmlns.com/foaf/0.1/"
     GEO = "http://www.w3.org/2003/01/geo/wgs84_pos#"
     OWL = "http://www.w3.org/2002/07/owl#"
diff --git a/pkg_api/pkg.py b/pkg_api/pkg.py
index 81135cd..a27c121 100644
--- a/pkg_api/pkg.py
+++ b/pkg_api/pkg.py
@@ -161,8 +161,8 @@ def visualize_graph(self) -> str:
         owner_name = ""
 
         for _, namespace in PKGPrefixes.__members__.items():
-            if namespace.value in str(self._owner_uri):
-                owner_name = self._owner_uri.replace(str(namespace.value), "")
+            if namespace.value.replace("#", "") in str(self._owner_uri):
+                owner_name = self._owner_uri.replace(str(namespace.value.replace("#", "")), "")
 
         path = self._visualization_path + "/" + owner_name + ".png"