diff --git a/README.md b/README.md
index 853062f..f26ccd0 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,5 @@ Turtle prefixes are hard coded for the time being. Ideally, these should be base
 
 ```ts
 const prefixes = new PrefixMapFactory().prefixMap();
-prefixes.set("ex", rdf.namedNode("http://example.org#"));
 prefixes.set("sh", rdf.namedNode("http://www.w3.org/ns/shacl#"));
 ```
diff --git a/src/index.ts b/src/index.ts
index c0637ee..a97b619 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -21,7 +21,6 @@ export async function validate(
 
     // Initialize the shared serializer.
     const prefixes = new PrefixMapFactory().prefixMap();
-    prefixes.set("ex", rdf.namedNode("http://example.org#"));
     prefixes.set("sh", rdf.namedNode("http://www.w3.org/ns/shacl#"));
     const serializer = new Serializer({ prefixes });
     const parser = rdf.formats.parsers.get("text/turtle")!;
diff --git a/tests/data/invalid.report.ttl b/tests/data/invalid.report.ttl
index 4c15d08..b81305d 100644
--- a/tests/data/invalid.report.ttl
+++ b/tests/data/invalid.report.ttl
@@ -1,28 +1,27 @@
-@prefix ex: <http://example.org#>.
 @prefix sh: <http://www.w3.org/ns/shacl#>.
 
 [ a sh:ValidationReport;
   sh:conforms false;
   sh:result [ a sh:ValidationResult;
-      sh:focusNode ex:ValidPoint;
+      sh:focusNode <http://example.org#ValidPoint>;
       sh:resultMessage "Requires an integer Y coordinate";
-      sh:resultPath ex:y;
+      sh:resultPath <http://example.org#y>;
       sh:resultSeverity sh:Violation;
       sh:sourceConstraintComponent sh:DatatypeConstraintComponent;
       sh:sourceShape [];
       sh:value "2"
     ], [ a sh:ValidationResult;
-      sh:focusNode ex:ValidPoint;
+      sh:focusNode <http://example.org#ValidPoint>;
       sh:resultMessage "Predicate is not allowed (closed shape)";
-      sh:resultPath ex:z;
+      sh:resultPath <http://example.org#z>;
       sh:resultSeverity sh:Violation;
       sh:sourceConstraintComponent sh:ClosedConstraintComponent;
-      sh:sourceShape ex:PointShape;
+      sh:sourceShape <http://example.org#PointShape>;
       sh:value "3"
     ], [ a sh:ValidationResult;
-      sh:focusNode ex:ValidPoint;
+      sh:focusNode <http://example.org#ValidPoint>;
       sh:resultMessage "Requires an integer X coordinate";
-      sh:resultPath ex:x;
+      sh:resultPath <http://example.org#x>;
       sh:resultSeverity sh:Violation;
       sh:sourceConstraintComponent sh:DatatypeConstraintComponent;
       sh:sourceShape [];