diff --git a/spring-core-test/src/main/java/org/springframework/aot/test/generate/compile/CompileWithTargetClassAccessClassLoader.java b/spring-core-test/src/main/java/org/springframework/aot/test/generate/compile/CompileWithTargetClassAccessClassLoader.java
index 03e3b7cd0ea..01e2085b51e 100644
--- a/spring-core-test/src/main/java/org/springframework/aot/test/generate/compile/CompileWithTargetClassAccessClassLoader.java
+++ b/spring-core-test/src/main/java/org/springframework/aot/test/generate/compile/CompileWithTargetClassAccessClassLoader.java
@@ -41,7 +41,7 @@ final class CompileWithTargetClassAccessClassLoader extends ClassLoader {
 
 	@Override
 	public Class<?> loadClass(String name) throws ClassNotFoundException {
-		if (name.startsWith("org.junit")) {
+		if (name.startsWith("org.junit") || name.startsWith("org.testng")) {
 			return Class.forName(name, false, this.testClassLoader);
 		}
 		return super.loadClass(name);