diff --git a/moulder/__init__.py b/moulder/__init__.py
index 1817940..eafd2d7 100644
--- a/moulder/__init__.py
+++ b/moulder/__init__.py
@@ -1,3 +1,4 @@
+from __future__ import absolute_import
 import sys
 from PyQt5.QtWidgets import QApplication
 
diff --git a/moulder/main_window.py b/moulder/main_window.py
index 18f84ab..00534a9 100644
--- a/moulder/main_window.py
+++ b/moulder/main_window.py
@@ -1,4 +1,4 @@
-from __future__ import print_function, division
+from __future__ import print_function, division, absolute_import
 from future.builtins import super
 
 import sys
@@ -10,9 +10,8 @@ from PyQt5.QtWidgets import QMainWindow, QAction
 from PyQt5.QtWidgets import QWidget, QVBoxLayout, QMessageBox, QDoubleSpinBox
 from PyQt5.QtWidgets import QSlider, QLabel
 
-from .double_slider import QDoubleSlider
+from .ui import QDoubleSlider, ConfigureMeassurementDialog
 from .moulder import Moulder
-from .configure_dialog import ConfigureMeassurementDialog
 
 DENSITY_RANGE = [-2000, 2000]
 
diff --git a/moulder/ui/__init__.py b/moulder/ui/__init__.py
new file mode 100644
index 0000000..342cc96
--- /dev/null
+++ b/moulder/ui/__init__.py
@@ -0,0 +1,3 @@
+from __future__ import absolute_import
+from .configure_dialog import ConfigureMeassurementDialog
+from .double_slider import QDoubleSlider
diff --git a/moulder/configure_dialog.py b/moulder/ui/configure_dialog.py
similarity index 98%
rename from moulder/configure_dialog.py
rename to moulder/ui/configure_dialog.py
index bfaf5ff..1d9a618 100644
--- a/moulder/configure_dialog.py
+++ b/moulder/ui/configure_dialog.py
@@ -1,4 +1,4 @@
-from __future__ import print_function
+from __future__ import print_function, absolute_import
 from future.builtins import super
 
 import numpy
diff --git a/moulder/double_slider.py b/moulder/ui/double_slider.py
similarity index 95%
rename from moulder/double_slider.py
rename to moulder/ui/double_slider.py
index 460159c..cca681f 100644
--- a/moulder/double_slider.py
+++ b/moulder/ui/double_slider.py
@@ -1,4 +1,4 @@
-from __future__ import division
+from __future__ import division, absolute_import
 from future.builtins import super
 
 from PyQt5.QtWidgets import QSlider