diff --git a/core/src/main/java/com/softwaremill/jox/CloseableChannel.java b/core/src/main/java/com/softwaremill/jox/CloseableChannel.java
index d0bfe28..6f1f34f 100644
--- a/core/src/main/java/com/softwaremill/jox/CloseableChannel.java
+++ b/core/src/main/java/com/softwaremill/jox/CloseableChannel.java
@@ -14,7 +14,7 @@
  * <p>
  * Closing the channel is thread-safe.
  */
-public interface CloseableChannel extends AutoCloseable {
+public interface CloseableChannel {
     /**
      * Close the channel, indicating that no more elements will be sent.
      * <p>
@@ -40,15 +40,6 @@ public interface CloseableChannel extends AutoCloseable {
      */
     Object doneSafe();
 
-    /**
-     * Same as {@link #done()}: close the channel, indicating that no more elements will be sent.
-     * <p>
-     * Enables using channel in {@code try-with-resources} blocks.
-     */
-    default void close() {
-        done();
-    }
-
     //
 
     /**
diff --git a/core/src/main/java/com/softwaremill/jox/CollectSource.java b/core/src/main/java/com/softwaremill/jox/CollectSource.java
index 81abd74..69b920f 100644
--- a/core/src/main/java/com/softwaremill/jox/CollectSource.java
+++ b/core/src/main/java/com/softwaremill/jox/CollectSource.java
@@ -117,11 +117,6 @@ public Object doneSafe() {
         return original.doneSafe();
     }
 
-    @Override
-    public void close() {
-        original.close();
-    }
-
     @Override
     public void error(Throwable reason) {
         original.error(reason);