diff --git a/src/rt/circular_buffer.cpp b/src/rt/circular_buffer.cpp
index 1b626920694..101d017663d 100644
--- a/src/rt/circular_buffer.cpp
+++ b/src/rt/circular_buffer.cpp
@@ -35,7 +35,7 @@ circular_buffer::~circular_buffer() {
              "~circular_buffer 0x%" PRIxPTR,
              this);
     I(dom, _buffer);
-    // I(dom, _unread == 0);
+    W(dom, _unread == 0, "~circular_buffer with unread messages.");
     dom->free(_buffer);
 }