diff --git a/smt/utils/design_space.py b/smt/utils/design_space.py
index 33ea4c9df..b03ee0e0b 100644
--- a/smt/utils/design_space.py
+++ b/smt/utils/design_space.py
@@ -31,6 +31,9 @@
 except ImportError:
     HAS_CONFIG_SPACE = False
 
+    class Configuration:
+        pass
+
     class ConfigurationSpace:
         pass