diff --git a/v2/build-system.jam b/v2/build-system.jam
index df48ec11f..6a313108a 100644
--- a/v2/build-system.jam
+++ b/v2/build-system.jam
@@ -589,6 +589,10 @@ local rule should-clean-project ( project )
             {
                 default-toolset = msvc ;
             }
+            else if [ os.name ] = MACOSX
+            {
+                default-toolset = darwin ;
+            }                        
         }
 
         ECHO "warning: No toolsets are configured." ;