diff --git a/include/boost/config/compiler/sgi_mipspro.hpp b/include/boost/config/compiler/sgi_mipspro.hpp
index 2ba47c96..51e9f6fe 100644
--- a/include/boost/config/compiler/sgi_mipspro.hpp
+++ b/include/boost/config/compiler/sgi_mipspro.hpp
@@ -11,6 +11,13 @@
 
 #include "boost/config/compiler/common_edg.hpp"
 
+//
+// Threading support:
+// Turn this on unconditionally here, it will get turned off again later
+// if no threading API is detected.
+//
+#define BOOST_HAS_THREADS
 //
 // version check:
 // probably nothing to do here?
+