diff --git a/core/src/main/java/org/apache/cxf/io/DelayedCachedOutputStreamCleaner.java b/core/src/main/java/org/apache/cxf/io/DelayedCachedOutputStreamCleaner.java
index 5124e4ef21a..65e85da0a68 100644
--- a/core/src/main/java/org/apache/cxf/io/DelayedCachedOutputStreamCleaner.java
+++ b/core/src/main/java/org/apache/cxf/io/DelayedCachedOutputStreamCleaner.java
@@ -120,7 +120,7 @@ private void clean(Collection<DelayedCloseable> closeables) {
                 final DelayedCloseable next = iterator.next();
                 try {
                     iterator.remove();
-                    LOG.warning("Unclosed (leaked?) stream detected: " + next.closeable);
+                    LOG.warning("Unclosed (leaked?) stream detected: " + next.closeable.hashCode());
                     next.closeable.close();
                 } catch (final IOException | RuntimeException ex) {
                     LOG.warning("Unable to close (leaked?) stream: " + ex.getMessage());