diff --git a/spring-boot-project/spring-boot-tools/spring-boot-jarmode-layertools/src/test/java/org/springframework/boot/jarmode/layertools/TestPrintStream.java b/spring-boot-project/spring-boot-tools/spring-boot-jarmode-layertools/src/test/java/org/springframework/boot/jarmode/layertools/TestPrintStream.java
index 109901b4773..f3d1beb43f8 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-jarmode-layertools/src/test/java/org/springframework/boot/jarmode/layertools/TestPrintStream.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-jarmode-layertools/src/test/java/org/springframework/boot/jarmode/layertools/TestPrintStream.java
@@ -37,7 +37,7 @@ import org.springframework.util.FileCopyUtils;
  */
 class TestPrintStream extends PrintStream implements AssertProvider<PrintStreamAssert> {
 
-	private final Class<? extends Object> testClass;
+	private final Class<?> testClass;
 
 	TestPrintStream(Object testInstance) {
 		super(new ByteArrayOutputStream());