diff --git a/tests/core/test_optimizable.py b/tests/core/test_optimizable.py
index 222c94ec1..079b245b5 100755
--- a/tests/core/test_optimizable.py
+++ b/tests/core/test_optimizable.py
@@ -97,7 +97,7 @@ def sum(self):
         return np.sum(self.local_full_x)
 
     def product(self):
-        return np.product(self.local_full_x)
+        return np.prod(self.local_full_x)
 
     return_fn_map = {'sum': sum, 'prod': product}