diff --git a/include/boost/config/compiler/visualc.hpp b/include/boost/config/compiler/visualc.hpp
index d23af835..d9465613 100644
--- a/include/boost/config/compiler/visualc.hpp
+++ b/include/boost/config/compiler/visualc.hpp
@@ -326,7 +326,7 @@
 #endif
 
 //
-// last known and checked version is 19.11.25506 (VC++ 2017.3):
+// last known and checked version is 19.11.25547 (VC++ 2017.4):
 #if (_MSC_VER > 1911)
 #  if defined(BOOST_ASSERT_CONFIG)
 #     error "Boost.Config is older than your current compiler version."