diff --git a/include/boost/config/compiler/digitalmars.hpp b/include/boost/config/compiler/digitalmars.hpp
index f5734c0c..240c2e3a 100644
--- a/include/boost/config/compiler/digitalmars.hpp
+++ b/include/boost/config/compiler/digitalmars.hpp
@@ -33,9 +33,7 @@
 #if (__DMC__ >= 0x840)
 #define BOOST_HAS_DIRENT_H
 #define BOOST_HAS_STDINT_H
-#if _MT
-#  define BOOST_HAS_WINTHREADS
-#endif
+#define BOOST_HAS_WINTHREADS
 #endif
 
 #if (__DMC__ >= 0x847)
@@ -63,3 +61,4 @@
 #  endif
 #endif
 
+