diff --git a/parl/remote/tests/cluster_monitor_2_test.py b/parl/remote/tests/cluster_monitor_2_test.py
index f27ee587b908093365426d7154f23d3adeccd721..61c36e42b67a3fe80fb10620ad7523a3a0d692f3 100644
--- a/parl/remote/tests/cluster_monitor_2_test.py
+++ b/parl/remote/tests/cluster_monitor_2_test.py
@@ -43,9 +43,6 @@ class Actor(object):
     def set_arg2(self, value):
         self.arg2 = value
 
-    def get_unable_serialize_object(self):
-        return UnableSerializeObject()
-
     def add_one(self, value):
         value += 1
         return value
diff --git a/parl/remote/tests/cluster_monitor_3_test.py b/parl/remote/tests/cluster_monitor_3_test.py
index 6570746a04d35651353960882538f17203610708..8726bd187e322edaa948b86248c1f8074479dd92 100644
--- a/parl/remote/tests/cluster_monitor_3_test.py
+++ b/parl/remote/tests/cluster_monitor_3_test.py
@@ -43,9 +43,6 @@ class Actor(object):
     def set_arg2(self, value):
         self.arg2 = value
 
-    def get_unable_serialize_object(self):
-        return UnableSerializeObject()
-
     def add_one(self, value):
         value += 1
         return value
diff --git a/parl/remote/tests/cluster_monitor_test.py b/parl/remote/tests/cluster_monitor_test.py
index 94341700c00ffc8b5e26b818fa9d394d02b0c60a..1f43626ff69f10d6165d6495c265370674b084c3 100644
--- a/parl/remote/tests/cluster_monitor_test.py
+++ b/parl/remote/tests/cluster_monitor_test.py
@@ -43,9 +43,6 @@ class Actor(object):
     def set_arg2(self, value):
         self.arg2 = value
 
-    def get_unable_serialize_object(self):
-        return UnableSerializeObject()
-
     def add_one(self, value):
         value += 1
         return value
diff --git a/parl/remote/tests/cluster_test.py b/parl/remote/tests/cluster_test.py
index 0ac9d0ba4e9b6e023528a91d3ba496aa010755f9..8eab666747fcb5b4ebf2e570ae4233fd42e429f2 100644
--- a/parl/remote/tests/cluster_test.py
+++ b/parl/remote/tests/cluster_test.py
@@ -43,9 +43,6 @@ class Actor(object):
     def set_arg2(self, value):
         self.arg2 = value
 
-    def get_unable_serialize_object(self):
-        return UnableSerializeObject()
-
     def add_one(self, value):
         value += 1
         return value
diff --git a/parl/remote/tests/reset_job_test.py b/parl/remote/tests/reset_job_test.py
index 478da6506821306d997ad788240178d4739c1bf6..c76a8dc87feca88bcd7e5f6b9335fcb4133dae4e 100644
--- a/parl/remote/tests/reset_job_test.py
+++ b/parl/remote/tests/reset_job_test.py
@@ -43,9 +43,6 @@ class Actor(object):
     def set_arg2(self, value):
         self.arg2 = value
 
-    def get_unable_serialize_object(self):
-        return UnableSerializeObject()
-
     def add_one(self, value):
         value += 1
         return value
diff --git a/parl/remote/tests/reset_job_test_alone.py b/parl/remote/tests/reset_job_test_alone.py
index 425f02ad4ee8acca93560d6a4de5e4836112ffb9..a438268a2238a8c2f029f6c5faacc59af0c44b05 100644
--- a/parl/remote/tests/reset_job_test_alone.py
+++ b/parl/remote/tests/reset_job_test_alone.py
@@ -41,9 +41,6 @@ class Actor(object):
     def set_arg2(self, value):
         self.arg2 = value
 
-    def get_unable_serialize_object(self):
-        return UnableSerializeObject()
-
     def add_one(self, value):
         value += 1
         return value