diff --git a/spring-boot/src/main/java/org/springframework/boot/env/DunnoEnumerablePropertySource.java b/spring-boot/src/main/java/org/springframework/boot/env/DunnoEnumerablePropertySource.java
deleted file mode 100644
index 81955e3a760..00000000000
--- a/spring-boot/src/main/java/org/springframework/boot/env/DunnoEnumerablePropertySource.java
+++ /dev/null
@@ -1,23 +0,0 @@
-/*
- * Copyright 2012-2017 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.boot.env;
-/**
- * @author pwebb
- */
-public interface DunnoEnumerablePropertySource {
-
-}
diff --git a/spring-boot/src/main/java/org/springframework/boot/env/DunnoPropertySource.java b/spring-boot/src/main/java/org/springframework/boot/env/DunnoPropertySource.java
deleted file mode 100644
index 628888a107e..00000000000
--- a/spring-boot/src/main/java/org/springframework/boot/env/DunnoPropertySource.java
+++ /dev/null
@@ -1,28 +0,0 @@
-/*
- * Copyright 2012-2017 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.boot.env;
-
-/**
- * @author pwebb
- */
-public interface DunnoPropertySource {
-
-	boolean containsProperty(String name);
-
-	Object getProperty(String name);
-
-}