diff --git a/spring-core-test/src/main/java/org/springframework/aot/test/generator/compile/DynamicClassLoader.java b/spring-core-test/src/main/java/org/springframework/aot/test/generator/compile/DynamicClassLoader.java
index 8c13a234cbf..b1e2c4cd601 100644
--- a/spring-core-test/src/main/java/org/springframework/aot/test/generator/compile/DynamicClassLoader.java
+++ b/spring-core-test/src/main/java/org/springframework/aot/test/generator/compile/DynamicClassLoader.java
@@ -57,6 +57,9 @@ public class DynamicClassLoader extends ClassLoader {
 		this.resourceFiles = resourceFiles;
 		this.classFiles = classFiles;
 		this.defineClassMethod = findDefineClassMethod(parent);
+		if (this.defineClassMethod != null) {
+			classFiles.forEach(this::defineClass);
+		}
 	}
 
 	@Nullable