diff --git a/tests/org.eclipse.emf.edapt.tests/pom.xml b/tests/org.eclipse.emf.edapt.tests/pom.xml
index b135fc4..e5125f0 100644
--- a/tests/org.eclipse.emf.edapt.tests/pom.xml
+++ b/tests/org.eclipse.emf.edapt.tests/pom.xml
@@ -42,6 +42,7 @@
 				<artifactId>tycho-surefire-plugin</artifactId>
 				<version>${tycho-version}</version>
 				<configuration>
+					<argLine>--add-opens java.base/java.lang=ALL-UNNAMED</argLine>
 					<useUIHarness>false</useUIHarness>
 					<useUIThread>false</useUIThread>
 					<includes>