diff --git a/deap/cma.py b/deap/cma.py
index 9b6a2050..e458f47b 100644
--- a/deap/cma.py
+++ b/deap/cma.py
@@ -23,6 +23,7 @@
 import copy
 from math import sqrt, log, exp
 from itertools import cycle
+import warnings
 
 import numpy