diff --git a/src/main/java/org/terasology/moduletestingenvironment/MTEExtension.java b/src/main/java/org/terasology/moduletestingenvironment/MTEExtension.java
index c1d3083..f19527f 100644
--- a/src/main/java/org/terasology/moduletestingenvironment/MTEExtension.java
+++ b/src/main/java/org/terasology/moduletestingenvironment/MTEExtension.java
@@ -18,6 +18,7 @@
 import org.junit.jupiter.api.extension.TestInstancePostProcessor;
 import org.opentest4j.MultipleFailuresError;
 import org.slf4j.LoggerFactory;
+import org.terasology.engine.core.module.ModuleManager;
 import org.terasology.moduletestingenvironment.extension.Dependencies;
 import org.terasology.moduletestingenvironment.extension.UseWorldGenerator;
 import org.terasology.engine.registry.In;
@@ -65,6 +66,8 @@ public void afterAll(ExtensionContext context) throws Exception {
 
     @Override
     public void beforeAll(ExtensionContext context) throws Exception {
+        System.setProperty(ModuleManager.LOAD_CLASSPATH_MODULES_PROPERTY, "true");
+
         if (context.getRequiredTestClass().isAnnotationPresent(Nested.class)) {
             // nested classes get set up in the parent
             ModuleTestingHelper parentHelper = helperContexts.get(context.getRequiredTestClass().getEnclosingClass());