diff --git a/metafix/src/main/java/org/metafacture/metafix/maps/RdfMap.java b/metafix/src/main/java/org/metafacture/metafix/maps/RdfMap.java
index c2be7993..53131534 100644
--- a/metafix/src/main/java/org/metafacture/metafix/maps/RdfMap.java
+++ b/metafix/src/main/java/org/metafacture/metafix/maps/RdfMap.java
@@ -56,7 +56,7 @@
  */
 public final class RdfMap extends AbstractReadOnlyMap<String, String> {
     public static final String TARGET = "target";
-    public static final String TARGET_LANGUAGE = "target_language";
+    public static final String TARGET_LANGUAGE = "select_language";
     public static final String SELECT = "select";
     private static final int MAX_REDIRECTIONS = 10;
     private static final int MIN_HTTP_STATUS_CODE = 299;
diff --git a/metafix/src/test/java/org/metafacture/metafix/MetafixLookupTest.java b/metafix/src/test/java/org/metafacture/metafix/MetafixLookupTest.java
index 797656d6..dfbd1be6 100644
--- a/metafix/src/test/java/org/metafacture/metafix/MetafixLookupTest.java
+++ b/metafix/src/test/java/org/metafacture/metafix/MetafixLookupTest.java
@@ -1049,7 +1049,7 @@ public void shouldLookupRdfUrlWithRedirection() {
     public void shouldLookupInExternalRdfMapGetObjectOfSubjectWithTargetedPredicateOfSpecificLanguage() {
         MetafixTestHelpers.assertFix(streamReceiver, Arrays.asList(
                 "set_array('prefLabel', 'https://w3id.org/kim/hochschulfaechersystematik/n4')",
-                "lookup_rdf('prefLabel.*', '" + RDF_MAP + "', target: 'skos:prefLabel', target_language: 'de')"
+                "lookup_rdf('prefLabel.*', '" + RDF_MAP + "', target: 'skos:prefLabel', select_language: 'de')"
             ),
             i -> {
                 i.startRecord("1");
@@ -1067,7 +1067,7 @@ public void shouldLookupInExternalRdfMapGetObjectOfSubjectWithTargetedPredicateO
     public void shouldLookupInExternalRdfMapGetSubjectWithTargetedPredicateOfSpecificLanguage() {
         MetafixTestHelpers.assertFix(streamReceiver, Arrays.asList(
                 "set_array('id', 'Mathematics, Natural Sciences')",
-                "lookup_rdf('id.*', '" + RDF_MAP + "', target: 'skos:prefLabel', target_language: 'en')"
+                "lookup_rdf('id.*', '" + RDF_MAP + "', target: 'skos:prefLabel', select_language: 'en')"
             ),
             i -> {
                 i.startRecord("1");
@@ -1086,7 +1086,7 @@ public void shouldLookupInExternalRdfMapGetSubjectWithTargetedPredicateOfSpecifi
     @Test // Scenario lookupRdfPropertyToProperty
     public void shouldLookupInExternalRdfMapGetPropertyOfSpecificLanguageWithTargetedPredicate() {
         MetafixTestHelpers.assertFix(streamReceiver, Arrays.asList(
-                "lookup_rdf('a', '" + HCRT_RDF_MAP + "', target: 'skos:prefLabel', target_language: 'en')"
+                "lookup_rdf('a', '" + HCRT_RDF_MAP + "', target: 'skos:prefLabel', select_language: 'en')"
             ),
             i -> {
                 i.startRecord("1");
@@ -1122,7 +1122,7 @@ public void shouldLookupInExternalRdfMapGetSubjectOfPropertyWithTargetedPredicat
     @Test
     public void lookupRdfDefinedPropertyToSubjectNonDefault() {
         MetafixTestHelpers.assertFix(streamReceiver, Arrays.asList(
-                "lookup_rdf('a', '" + HCRT_RDF_MAP + "', target: 'skos:prefLabel', target_language: 'de')"
+                "lookup_rdf('a', '" + HCRT_RDF_MAP + "', target: 'skos:prefLabel', select_language: 'de')"
             ),
             i -> {
                 i.startRecord("1");
@@ -1160,7 +1160,7 @@ public void shouldLookupInExternalRdfMapGetObjectWithTargetedPredicateOfSpecific
     @Test
     public void shouldLookupRdfDefinedPropertyToSubject() {
         MetafixTestHelpers.assertFix(streamReceiver, Arrays.asList(
-                "lookup_rdf('a', '" + HCRT_RDF_MAP + "', target: 'skos:prefLabel', target_language: 'de', select: 'subject')"
+                "lookup_rdf('a', '" + HCRT_RDF_MAP + "', target: 'skos:prefLabel', select_language: 'de', select: 'subject')"
             ),
             i -> {
                 i.startRecord("1");
@@ -1204,7 +1204,7 @@ public void shouldLookupRdfDefinedPropertyToSubject() {
     private void shouldLookupInExternalRdfMapGetObjectWithTargetedPredicateOfSpecificLanguage(final String target) {
         MetafixTestHelpers.assertFix(streamReceiver, Arrays.asList(
                 "set_array('prefLabel', 'Mathematics, Natural Sciences')",
-                "lookup_rdf('prefLabel.*', '" + RDF_MAP + "', target: '" + target + "', target_language: 'de')"
+                "lookup_rdf('prefLabel.*', '" + RDF_MAP + "', target: '" + target + "', select_language: 'de')"
             ),
             i -> {
                 i.startRecord("1");
diff --git a/metafix/src/test/resources/org/metafacture/metafix/integration/lookup/fromJson/toJson/lookupRdfDefinedPropertyToProperty/test.fix b/metafix/src/test/resources/org/metafacture/metafix/integration/lookup/fromJson/toJson/lookupRdfDefinedPropertyToProperty/test.fix
index 88563268..ad18850e 100644
--- a/metafix/src/test/resources/org/metafacture/metafix/integration/lookup/fromJson/toJson/lookupRdfDefinedPropertyToProperty/test.fix
+++ b/metafix/src/test/resources/org/metafacture/metafix/integration/lookup/fromJson/toJson/lookupRdfDefinedPropertyToProperty/test.fix
@@ -1,4 +1,4 @@
-lookup_rdf("a", "../../../../../maps/hcrt.ttl", target: "http://www.w3.org/2004/02/skos/core#prefLabel", target_language: "en", select: "object")
+lookup_rdf("a", "../../../../../maps/hcrt.ttl", target: "http://www.w3.org/2004/02/skos/core#prefLabel", select_language: "en")
 # Cant define specific lookup-match fields, would expect something like this:
-# lookup_rdf("a", "./hcrt.ttl", match="http://www.w3.org/2004/02/skos/core#prefLabel", match_language: "de", target: "http://www.w3.org/2004/02/skos/core#prefLabel", target_language: "en")
+# lookup_rdf("a", "./hcrt.ttl", match="http://www.w3.org/2004/02/skos/core#prefLabel", match_language: "de", target: "http://www.w3.org/2004/02/skos/core#prefLabel", select_language: "en")
 
diff --git a/metafix/src/test/resources/org/metafacture/metafix/integration/lookup/fromJson/toJson/lookupRdfDefinedPropertyToSubject/test.fix b/metafix/src/test/resources/org/metafacture/metafix/integration/lookup/fromJson/toJson/lookupRdfDefinedPropertyToSubject/test.fix
index f896e055..4890cd65 100644
--- a/metafix/src/test/resources/org/metafacture/metafix/integration/lookup/fromJson/toJson/lookupRdfDefinedPropertyToSubject/test.fix
+++ b/metafix/src/test/resources/org/metafacture/metafix/integration/lookup/fromJson/toJson/lookupRdfDefinedPropertyToSubject/test.fix
@@ -1,4 +1,4 @@
-lookup_rdf('a', '../../../../../maps/hcrt.ttl', target: 'http://www.w3.org/2004/02/skos/core#prefLabel', target_language: 'de', select: 'subject')
+lookup_rdf('a', '../../../../../maps/hcrt.ttl', target: 'http://www.w3.org/2004/02/skos/core#prefLabel', select_language: 'de', select: 'subject')
 # Cant define specific lookup-match fields, would expect something like this:
 # lookup_rdf("a", "./hcrt.ttl", match="http://www.w3.org/2004/02/skos/core#prefLabel", match_language: "de")
 
diff --git a/metafix/src/test/resources/org/metafacture/metafix/integration/lookup/fromJson/toJson/lookupRdfPropertyToProperty/test.fix b/metafix/src/test/resources/org/metafacture/metafix/integration/lookup/fromJson/toJson/lookupRdfPropertyToProperty/test.fix
index e633a4c1..dd18b144 100644
--- a/metafix/src/test/resources/org/metafacture/metafix/integration/lookup/fromJson/toJson/lookupRdfPropertyToProperty/test.fix
+++ b/metafix/src/test/resources/org/metafacture/metafix/integration/lookup/fromJson/toJson/lookupRdfPropertyToProperty/test.fix
@@ -1 +1 @@
-lookup_rdf("a", "../../../../../maps/hcrt.ttl", target: "http://www.w3.org/2004/02/skos/core#prefLabel", target_language: 'en')
+lookup_rdf("a", "../../../../../maps/hcrt.ttl", target: "http://www.w3.org/2004/02/skos/core#prefLabel", select_language: 'en')
diff --git a/metafix/src/test/resources/org/metafacture/metafix/integration/lookup/fromJson/toJson/lookupRdfSubjectToProperty/test.fix b/metafix/src/test/resources/org/metafacture/metafix/integration/lookup/fromJson/toJson/lookupRdfSubjectToProperty/test.fix
index c4a374af..ee40f8c0 100644
--- a/metafix/src/test/resources/org/metafacture/metafix/integration/lookup/fromJson/toJson/lookupRdfSubjectToProperty/test.fix
+++ b/metafix/src/test/resources/org/metafacture/metafix/integration/lookup/fromJson/toJson/lookupRdfSubjectToProperty/test.fix
@@ -1,2 +1,2 @@
 # Lookup replaces with default value by default. Should be an option.
-lookup_rdf("a", "../../../../../maps/hcrt.ttl", target: "http://www.w3.org/2004/02/skos/core#prefLabel", target_language: "de")
+lookup_rdf("a", "../../../../../maps/hcrt.ttl", target: "http://www.w3.org/2004/02/skos/core#prefLabel", select_language: "de")