diff --git a/src/build/generators.jam b/src/build/generators.jam
index d1f711503..80cf55879 100644
--- a/src/build/generators.jam
+++ b/src/build/generators.jam
@@ -475,7 +475,13 @@ class generator
         }
         if $(result)
         {
-            return $(relevant) $(result) ;
+            if [ class.is-a $(result[1]) : property-set ]
+            {
+                return [ $(result[1]).add $(relevant) ] $(result[2-]) ;
+            }
+            else {
+               return $(relevant) $(result) ;
+            }
         }
     }