diff --git a/pyproject.toml b/pyproject.toml
index 4f29747..140735d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [tool.poetry]
 description = "Generate continuous time stationary stochastic processes from a given auto correlation function."
 name = "stocproc"
-version = "1.0.4"
+version = "1.0.5"
 authors = ["Richard Hartmann <richard.hartmann@tu-dresden.de>"]
 license = "BSD (3 clause)"
 classifiers = [
diff --git a/stocproc/method_ft.py b/stocproc/method_ft.py
index d9dc7c6..f93059a 100644
--- a/stocproc/method_ft.py
+++ b/stocproc/method_ft.py
@@ -533,7 +533,7 @@ def get_dt_for_accurate_interpolation(t_max, tol, ft_ref, diff_method=_absDiff):
 
         pool = Pool()
         try:
-            ft_ref_n_new = pool.map(ft_ref, tau[1::2])
+            ft_ref_n_new = np.asarray(pool.map(ft_ref, tau[1::2]))
 
         finally:
             pool.close()