diff --git a/v2/build/feature.py b/v2/build/feature.py
index 208969802..3d071c8bc 100644
--- a/v2/build/feature.py
+++ b/v2/build/feature.py
@@ -246,6 +246,10 @@ def is_implicit_value (value_string):
     """ Returns true iff 'value_string' is a value_string
     of an implicit feature.
     """
+
+    if __implicit_features.has_key(value_string):
+        return __implicit_features[value_string]
+    
     v = value_string.split('-')
 
     if not __implicit_features.has_key(v[0]):