diff --git a/CHANGELOG.md b/CHANGELOG.md
index f30f4ec0..bb67b566 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 Version XXX:
 
+* Fix unreachable code warning with MSVC.
 * Fix logic error in advance_server_flex.
 * Fix file open with append_existing flag on posix.
 * Websocket SSL `teardown` also tears down underlying TCP.
diff --git a/include/boost/beast/core/impl/buffers_cat.hpp b/include/boost/beast/core/impl/buffers_cat.hpp
index a0506a0b..feb41ba4 100644
--- a/include/boost/beast/core/impl/buffers_cat.hpp
+++ b/include/boost/beast/core/impl/buffers_cat.hpp
@@ -52,7 +52,7 @@ public:
 
 #if defined(_MSC_VER) && ! defined(__clang__)
 # define BOOST_BEAST_UNREACHABLE() __assume(false)
-# define BOOST_BEAST_UNREACHABLE_RETURN(v) __assume(false)
+# define BOOST_BEAST_UNREACHABLE_RETURN(v) return v
 #else
 # define BOOST_BEAST_UNREACHABLE() __builtin_unreachable()
 # define BOOST_BEAST_UNREACHABLE_RETURN(v) \