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-rw-r--r--libstdc++/stl/stl_config.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/libstdc++/stl/stl_config.h b/libstdc++/stl/stl_config.h
index d72f9e1c746..bffce401def 100644
--- a/libstdc++/stl/stl_config.h
+++ b/libstdc++/stl/stl_config.h
@@ -201,6 +201,9 @@
# if defined(__MINGW32__)
# define __STL_NO_DRAND48
+# ifdef _MT
+# define __STL_WIN32THREADS
+# endif
# endif
# if defined(__CYGWIN__)