diff --git a/sapi-lib/src/main/java/com/epimorphics/simpleAPI/requests/FilterRequestProcessor.java b/sapi-lib/src/main/java/com/epimorphics/simpleAPI/requests/FilterRequestProcessor.java
index 0d9c82d..9cb6f96 100644
--- a/sapi-lib/src/main/java/com/epimorphics/simpleAPI/requests/FilterRequestProcessor.java
+++ b/sapi-lib/src/main/java/com/epimorphics/simpleAPI/requests/FilterRequestProcessor.java
@@ -74,10 +74,17 @@ public ListQueryBuilder process(Request request, ListQueryBuilder builder,
     
     private static RDFNode asValue(String value, String type, String valueBase) {
         if (valueBase != null && ! NameUtils.isURI(value)) {
-            value = NameUtils.ensureLastSlash(valueBase) + value;
+            value = NameUtils.ensureLastSlash(valueBase) + sanitiseURI(value);
         }
         // TODO have a configurable default language, currently this will default to "@en"
         return TypeUtil.asTypedValue(value, type);
     }
+
+    // Remove characters in URI stub that Jena fails to escape in Sparql serialisation
+    private static String sanitiseURI(String value) {
+        return value.replace("<", "%36")
+                .replace(">", "%3E")
+                .replace("'", "%27");
+    }
     
 }