diff --git a/xesn/optim.py b/xesn/optim.py
index e47a452..56e1352 100644
--- a/xesn/optim.py
+++ b/xesn/optim.py
@@ -9,7 +9,7 @@
 from smt.surrogate_models import KRG
 try:
     from smt.utils.design_space import DesignSpace
-except ImportError
+except ImportError:
     from smt.design_space import DesignSpace
 
 def optimize(cost_function, **kwargs):