diff --git a/include/kpn/pool_node.hpp b/include/kpn/pool_node.hpp
index 96eac9d..ee32d19 100644
--- a/include/kpn/pool_node.hpp
+++ b/include/kpn/pool_node.hpp
@@ -732,6 +732,11 @@ private:
             ch->push_sentinel(std::move(val));
             return;
         }
+        // Lossless mode: block until the consumer drains instead of dropping.
+        if (lossless_) {
+            ch->push_blocking(std::move(val));
+            return;
+        }
         try {
             ch->push(std::move(val));
         } catch (const ChannelOverflowError&) {