diff --git a/rockspecs/rings-cvs-3.rockspec b/rockspecs/rings-cvs-3.rockspec
index c32924a..8463a78 100644
--- a/rockspecs/rings-cvs-3.rockspec
+++ b/rockspecs/rings-cvs-3.rockspec
@@ -34,7 +34,7 @@ build = {
         type = "make",
        	build_variables = {
          LUA_LIB = "$(LUA_LIBDIR)\\lua5.1.lib",
-         CFLAGS = "/MT $(CFLAGS) /I$(LUA_INCDIR)",
+         CFLAGS = "/MD $(CFLAGS) /I$(LUA_INCDIR)",
        	},
        	install_variables = {
          LUA_LIBDIR = "$(LIBDIR)",