diff --git a/model/sparql/GenericSparql.php b/model/sparql/GenericSparql.php
index ccf40b30b..caf6678e0 100644
--- a/model/sparql/GenericSparql.php
+++ b/model/sparql/GenericSparql.php
@@ -166,7 +166,8 @@ private function shortenUri($uri) {
         if (!array_key_exists($uri, $this->qnamecache)) {
             $res = new EasyRdf\Resource($uri);
             $qname = $res->shorten(); // returns null on failure
-            $this->qnamecache[$uri] = ($qname !== null) ? $qname : $uri;
+            // only URIs in the SKOS namespace are shortened
+            $this->qnamecache[$uri] = ($qname !== null && strpos($qname, "skos:") === 0) ? $qname : $uri;
         }
         return $this->qnamecache[$uri];
     }
diff --git a/tests/RestControllerTest.php b/tests/RestControllerTest.php
index 531692da3..fd8380bc3 100644
--- a/tests/RestControllerTest.php
+++ b/tests/RestControllerTest.php
@@ -190,7 +190,7 @@ public function testSearchJsonLd() {
          "uri":"http://www.skosmos.skos/test/ta117",
          "type":[
             "skos:Concept",
-            "meta:TestClass"
+            "http://www.skosmos.skos/test-meta/TestClass"
          ],
          "prefLabel":"3D Bass",
          "lang":"en",
@@ -200,7 +200,7 @@ public function testSearchJsonLd() {
          "uri":"http://www.skosmos.skos/test/ta116",
          "type":[
             "skos:Concept",
-            "meta:TestClass"
+            "http://www.skosmos.skos/test-meta/TestClass"
          ],
          "prefLabel":"Bass",
          "lang":"en",
@@ -210,7 +210,7 @@ public function testSearchJsonLd() {
          "uri":"http://www.skosmos.skos/test/ta122",
          "type":[
             "skos:Concept",
-            "meta:TestClass"
+            "http://www.skosmos.skos/test-meta/TestClass"
          ],
          "prefLabel":"Black sea bass",
          "lang":"en",
@@ -259,7 +259,7 @@ public function testSearchJsonLdWithAdditionalFields() {
          "uri":"http://www.skosmos.skos/test/ta117",
          "type":[
             "skos:Concept",
-            "meta:TestClass"
+            "http://www.skosmos.skos/test-meta/TestClass"
          ],
          "broader":[
             {
@@ -279,7 +279,7 @@ public function testSearchJsonLdWithAdditionalFields() {
          "uri":"http://www.skosmos.skos/test/ta116",
          "type":[
             "skos:Concept",
-            "meta:TestClass"
+            "http://www.skosmos.skos/test-meta/TestClass"
          ],
          "broader":[
             {
@@ -294,7 +294,7 @@ public function testSearchJsonLdWithAdditionalFields() {
          "uri":"http://www.skosmos.skos/test/ta122",
          "type":[
             "skos:Concept",
-            "meta:TestClass"
+            "http://www.skosmos.skos/test-meta/TestClass"
          ],
          "broader":[
             {