diff --git a/scrapers/src/main/java/nl/esciencecenter/rsd/scraper/ror/RorPostgrestConnector.java b/scrapers/src/main/java/nl/esciencecenter/rsd/scraper/ror/RorPostgrestConnector.java
index 5e6090ddf..090822ef8 100644
--- a/scrapers/src/main/java/nl/esciencecenter/rsd/scraper/ror/RorPostgrestConnector.java
+++ b/scrapers/src/main/java/nl/esciencecenter/rsd/scraper/ror/RorPostgrestConnector.java
@@ -1,5 +1,5 @@
-// SPDX-FileCopyrightText: 2023 Ewan Cahen (Netherlands eScience Center) <e.cahen@esciencecenter.nl>
-// SPDX-FileCopyrightText: 2023 Netherlands eScience Center
+// SPDX-FileCopyrightText: 2023 - 2024 Ewan Cahen (Netherlands eScience Center) <e.cahen@esciencecenter.nl>
+// SPDX-FileCopyrightText: 2023 - 2024 Netherlands eScience Center
 // SPDX-FileCopyrightText: 2024 Christian Meeßen (GFZ) <christian.meessen@gfz-potsdam.de>
 // SPDX-FileCopyrightText: 2024 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences
 //
@@ -7,19 +7,18 @@
 
 package nl.esciencecenter.rsd.scraper.ror;
 
-import java.time.format.DateTimeFormatter;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.UUID;
-
 import com.google.gson.JsonArray;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
 import com.google.gson.JsonParser;
-
 import nl.esciencecenter.rsd.scraper.Config;
 import nl.esciencecenter.rsd.scraper.Utils;
 
+import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.UUID;
+
 public class RorPostgrestConnector {
 	private final String backendUrl;
 
@@ -28,7 +27,7 @@ public RorPostgrestConnector() {
 	}
 
 	public Collection<BasicOrganisationData> organisationsWithoutLocation(int limit) {
-		String filter = "organisation?ror_id=isdistinct.null&or=(country.is.null,city.is.null)&limit=" + limit;
+		String filter = "organisation?ror_id=not.is.null&or=(country.is.null,city.is.null)&limit=" + limit;
 		String data = Utils.getAsAdmin(backendUrl + "/" + filter);
 		return parseBasicJsonData(data);
 	}
diff --git a/scrapers/src/test/java/nl/esciencecenter/rsd/scraper/ror/RorScraperTest.java b/scrapers/src/test/java/nl/esciencecenter/rsd/scraper/ror/RorScraperTest.java
index 53aded89a..27df6aa8e 100644
--- a/scrapers/src/test/java/nl/esciencecenter/rsd/scraper/ror/RorScraperTest.java
+++ b/scrapers/src/test/java/nl/esciencecenter/rsd/scraper/ror/RorScraperTest.java
@@ -1,18 +1,23 @@
 // SPDX-FileCopyrightText: 2024 Christian Meeßen (GFZ) <christian.meessen@gfz-potsdam.de>
+// SPDX-FileCopyrightText: 2024 Ewan Cahen (Netherlands eScience Center) <e.cahen@esciencecenter.nl>
 // SPDX-FileCopyrightText: 2024 Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences
+// SPDX-FileCopyrightText: 2024 Netherlands eScience Center
 //
 // SPDX-License-Identifier: Apache-2.0
 
 package nl.esciencecenter.rsd.scraper.ror;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
-import org.junit.jupiter.api.Test;
-
 import com.github.tomakehurst.wiremock.client.WireMock;
 import com.github.tomakehurst.wiremock.junit5.WireMockTest;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
 
-import static com.github.tomakehurst.wiremock.client.WireMock.*;
+import static com.github.tomakehurst.wiremock.client.WireMock.aResponse;
+import static com.github.tomakehurst.wiremock.client.WireMock.get;
+import static com.github.tomakehurst.wiremock.client.WireMock.stubFor;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
 
 
 @WireMockTest(proxyMode = true)
@@ -42,55 +47,25 @@ void testLocations() throws Exception {
 
 	}
 
-	@Test
-	void testNullLocations() throws Exception {
-		stubFor(
-			get(apiPath)
-			.withHost(WireMock.equalTo(apiDomain))
-			.willReturn(
-				aResponse()
-				.withStatus(200)
-				.withBody("{\"addresses\": [{\"city\": null}], \"country\": {\"country_name\": null}}")
-			));
-		
-		rorScraper = new RorScraper("http://" + apiDomain + apiPath);
-
-		assertEquals(null, rorScraper.city());
-		assertEquals(null, rorScraper.country());
-	}
-	
-	@Test
-	void testEmpyLocations() throws Exception {
-		stubFor(
-			get(apiPath)
-			.withHost(WireMock.equalTo(apiDomain))
-			.willReturn(
-				aResponse()
-				.withStatus(200)
-				.withBody("{\"addresses\": [],\"country\": {}}")
-			)
-		);
-
-		rorScraper = new RorScraper("http://" + apiDomain + apiPath);
-
-		assertEquals(null, rorScraper.city());
-		assertEquals(null, rorScraper.country());
-	}
-
-	@Test
-	void testEmptyResponse() throws Exception {
+@ParameterizedTest
+@ValueSource(strings = {
+		"{\"addresses\": [{\"city\": null}], \"country\": {\"country_name\": null}}",
+		"{\"addresses\": [],\"country\": {}}",
+		"{}",
+})
+	void testNullLocationsOrEmptyLocationOrEmptyResponse(String jsonBody) throws Exception {
 		stubFor(
 			get(apiPath)
 			.withHost(WireMock.equalTo(apiDomain))
 			.willReturn(
 				aResponse()
 				.withStatus(200)
-				.withBody("{}")
+				.withBody(jsonBody)
 			));
 		
 		rorScraper = new RorScraper("http://" + apiDomain + apiPath);
 
-		assertEquals(null, rorScraper.city());
-		assertEquals(null, rorScraper.country());
+		assertNull(rorScraper.city());
+		assertNull(rorScraper.country());
 	}
 }