diff --git a/core/deployment/src/main/java/io/quarkus/deployment/dev/testing/TestSupport.java b/core/deployment/src/main/java/io/quarkus/deployment/dev/testing/TestSupport.java
index bbbf37d8acbb09..1e65b09d078233 100644
--- a/core/deployment/src/main/java/io/quarkus/deployment/dev/testing/TestSupport.java
+++ b/core/deployment/src/main/java/io/quarkus/deployment/dev/testing/TestSupport.java
@@ -129,7 +129,7 @@ public void init() {
                         .setAssertionsEnabled(true)
                         .setDisableClasspathCache(false)
                         .setIsolateDeployment(true)
-                        .setBaseClassLoader(getClass().getClassLoader())
+                        .setBaseClassLoader(getClass().getClassLoader().getParent())
                         .setTest(true)
                         .setAuxiliaryApplication(true)
                         .setHostApplicationIsTestOnly(devModeType == DevModeType.TEST_ONLY)