diff --git a/pyproject.toml b/pyproject.toml
index 5d4b0e1..0ca0a1e 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 = "1.0.2"
+version = "1.0.3"
 authors = ["Richard Hartmann <richard.hartmann@tu-dresden.de>"]
 license = "BSD (3 clause)"
 classifiers = [
diff --git a/stocproc/stocproc.py b/stocproc/stocproc.py
index 8880292..f380a5d 100644
--- a/stocproc/stocproc.py
+++ b/stocproc/stocproc.py
@@ -114,6 +114,9 @@ class StocProc(abc.ABC):
             )
         )
 
+    def __bfkey__(self):
+        return self.key
+
     def __call__(self, t=None):
         r"""Evaluates the stochastic process.
 
@@ -367,9 +370,6 @@ class StocProc_KLE(StocProc):
     #     """
     #     return self.key
 
-    def __bfkey__(self):
-        return self.key
-
     def __getstate__(self):
         return (
             self.sqrt_lambda_ui_fine,