--- a/tools/features/debug-feature.jam
+++ b/tools/features/debug-feature.jam
@@ -8,7 +8,7 @@
 import feature ;
 
 feature.feature debug-symbols
-    : on off
+    : on off none
     : propagated ;
 
 feature.feature profiling
--- a/tools/features/optimization-feature.jam
+++ b/tools/features/optimization-feature.jam
@@ -8,7 +8,7 @@
 import feature ;
 
 feature.feature optimization
-    : off speed space
+    : off none speed space
     : propagated ;
 
 feature.feature inlining