diff --git a/CHANGELOG.md b/CHANGELOG.md
index 831ae945..7440742d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+Version 246:
+
+* decorator ctor is explicit
+
+--------------------------------------------------------------------------------
+
 Version 245:
 
 * decorator constructor is constrained
diff --git a/include/boost/beast/websocket/stream_base.hpp b/include/boost/beast/websocket/stream_base.hpp
index 47d98d3d..a214553f 100644
--- a/include/boost/beast/websocket/stream_base.hpp
+++ b/include/boost/beast/websocket/stream_base.hpp
@@ -73,6 +73,7 @@ struct stream_base
                     Decorator>::value>::type
 #endif
         >
+        explicit
         decorator(Decorator&& f)
             : d_(std::forward<Decorator>(f))
         {