diff --git a/master.cfg b/master.cfg
index 4767b8f..5add64b 100644
--- a/master.cfg
+++ b/master.cfg
@@ -1054,7 +1054,7 @@ The parameters of the class are:
         self.extra_conf_flags.append ("CXXFLAGS=%s" % default_CXXFLAGS + ' '.join (self.extra_CXXFLAGS))
         self.extra_conf_flags.append (architecture_triplet)
 
-        self.addStep (self.ConfigureClass (extra_conf_flags, haltOnFailure = True))
+        self.addStep (self.ConfigureClass (self.extra_conf_flags, haltOnFailure = True))
 
         if not self.extra_make_flags:
             self.extra_make_flags = []