diff --git a/rtde/__init__.py b/rtde/__init__.py
index 4393e42..7bec406 100644
--- a/rtde/__init__.py
+++ b/rtde/__init__.py
@@ -20,6 +20,3 @@
 # ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-from .rtde import *
-from .rtde_config import *
diff --git a/rtde/csv_binary_writer.py b/rtde/csv_binary_writer.py
index 45a06b5..f507834 100644
--- a/rtde/csv_binary_writer.py
+++ b/rtde/csv_binary_writer.py
@@ -21,12 +21,10 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+import struct
 import sys
 
-sys.path.append("..")
-
-import struct
-from rtde import serialize
+from . import serialize
 
 
 class CSVBinaryWriter(object):
diff --git a/rtde/csv_reader.py b/rtde/csv_reader.py
index b31ea08..d307168 100644
--- a/rtde/csv_reader.py
+++ b/rtde/csv_reader.py
@@ -22,9 +22,10 @@
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 import csv
-import numpy as np
 import logging
 
+import numpy as np
+
 from .rtde import LOGNAME
 
 _log = logging.getLogger(LOGNAME)
diff --git a/rtde/csv_writer.py b/rtde/csv_writer.py
index 5c2b281..cbb5189 100644
--- a/rtde/csv_writer.py
+++ b/rtde/csv_writer.py
@@ -23,11 +23,7 @@
 
 import csv
 
-import sys
-
-sys.path.append("..")
-
-from rtde import serialize
+from . import serialize
 
 
 class CSVWriter(object):
diff --git a/rtde/rtde.py b/rtde/rtde.py
index 4c09ce6..6ffaf8c 100644
--- a/rtde/rtde.py
+++ b/rtde/rtde.py
@@ -21,16 +21,13 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-import struct
-import socket
+import logging
 import select
+import socket
+import struct
 import sys
-import logging
 
-if sys.version_info[0] < 3:
-    import serialize
-else:
-    from rtde import serialize
+from . import serialize
 
 DEFAULT_TIMEOUT = 1.0
 
diff --git a/setup.py b/setup.py
index 40e9878..c3f73a3 100644
--- a/setup.py
+++ b/setup.py
@@ -34,4 +34,5 @@
     packages=["rtde"],
     version=version,
     description="Real-Time Data Exchange (RTDE) python client + examples",
+    install_requires=["numpy"],
 )