diff --git a/spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/classpath/ModifiedClassPathClassLoader.java b/spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/classpath/ModifiedClassPathClassLoader.java
index 44259b95b3..adae5409fb 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/classpath/ModifiedClassPathClassLoader.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/classpath/ModifiedClassPathClassLoader.java
@@ -77,7 +77,8 @@ final class ModifiedClassPathClassLoader extends URLClassLoader {
 
 	@Override
 	public Class<?> loadClass(String name) throws ClassNotFoundException {
-		if (name.startsWith("org.junit") || name.startsWith("org.hamcrest")) {
+		if (name.startsWith("org.junit") || name.startsWith("org.hamcrest")
+				|| name.startsWith("io.netty.internal.tcnative")) {
 			return Class.forName(name, false, this.junitLoader);
 		}
 		return super.loadClass(name);