diff --git a/modules/contrib/dunst.py b/modules/contrib/dunst.py
index 97209cb..10cd362 100644
--- a/modules/contrib/dunst.py
+++ b/modules/contrib/dunst.py
@@ -9,7 +9,7 @@ import core.input
 import util.cli
 
 class Module(core.module.Module):
-    def __init__(self, config=None):
+    def __init__(self, config):
         super().__init__(config, core.widget.Widget(''))
         self._paused = False
         # Make sure that dunst is currently not paused
diff --git a/modules/core/battery.py b/modules/core/battery.py
index 92c2cea..f5ecbdc 100644
--- a/modules/core/battery.py
+++ b/modules/core/battery.py
@@ -29,7 +29,7 @@ import util.format
 
 
 class Module(core.module.Module):
-    def __init__(self, config=None):
+    def __init__(self, config):
         widgets = []
         super().__init__(config, widgets)
 
diff --git a/modules/core/brightness.py b/modules/core/brightness.py
index 41f3fd2..78f65d3 100644
--- a/modules/core/brightness.py
+++ b/modules/core/brightness.py
@@ -16,7 +16,7 @@ import core.widget
 import core.input
 
 class Module(core.module.Module):
-    def __init__(self, config=None):
+    def __init__(self, config):
         super().__init__(config, core.widget.Widget(self.brightness))
 
         self._brightness = 0
diff --git a/modules/core/cpu.py b/modules/core/cpu.py
index 250f177..c25ab5b 100644
--- a/modules/core/cpu.py
+++ b/modules/core/cpu.py
@@ -15,7 +15,7 @@ import core.widget
 import core.input
 
 class Module(core.module.Module):
-    def __init__(self, config=None):
+    def __init__(self, config):
         super().__init__(config, core.widget.Widget(self.utilization))
         self.widget().set('theme.minwidth', self._format.format(100.0-10e-20))
         self._utilization = psutil.cpu_percent(percpu=False)
diff --git a/modules/core/disk.py b/modules/core/disk.py
index b98d5ca..a4dfebb 100644
--- a/modules/core/disk.py
+++ b/modules/core/disk.py
@@ -19,7 +19,7 @@ import core.input
 import util.format
 
 class Module(core.module.Module):
-    def __init__(self, config=None):
+    def __init__(self, config):
         super().__init__(config, core.widget.Widget(self.diskspace))
 
         self._path = self.parameter('path', '/')
diff --git a/modules/core/kernel.py b/modules/core/kernel.py
index c70c7f6..2ce05f1 100644
--- a/modules/core/kernel.py
+++ b/modules/core/kernel.py
@@ -9,7 +9,7 @@ import core.widget
 
 class Module(core.module.Module):
     @core.module.every(minutes=60)
-    def __init__(self, config=None):
+    def __init__(self, config):
         super().__init__(config, core.widget.Widget(self.full_text))
 
     def full_text(self, widgets):
diff --git a/modules/core/memory.py b/modules/core/memory.py
index 7fe4e84..2a6b090 100644
--- a/modules/core/memory.py
+++ b/modules/core/memory.py
@@ -18,7 +18,7 @@ import core.input
 import util.format
 
 class Module(core.module.Module):
-    def __init__(self, config=None):
+    def __init__(self, config):
         super().__init__(config, core.widget.Widget(self.memory_usage))
         core.input.register(self, button=core.input.LEFT_MOUSE,
             cmd='gnome-system-monitor')
diff --git a/modules/core/redshift.py b/modules/core/redshift.py
index cb43b90..24cc6f1 100644
--- a/modules/core/redshift.py
+++ b/modules/core/redshift.py
@@ -75,7 +75,7 @@ def get_redshift_value(widget, location, lat, lon):
                     widget.set('transition', ' '.join(line.split(' ')[2:]))
 
 class Module(core.module.Module):
-    def __init__(self, config=None):
+    def __init__(self, config):
         widget = core.widget.Widget(self.text)
         super().__init__(config, widget)
 
diff --git a/modules/core/sensors2.py b/modules/core/sensors2.py
index 1726dae..120800a 100644
--- a/modules/core/sensors2.py
+++ b/modules/core/sensors2.py
@@ -22,7 +22,7 @@ import util.cli
 import util.format
 
 class Module(core.module.Module):
-    def __init__(self, config=None):
+    def __init__(self, config):
         super().__init__(config, [])
 
         self.__chip = self.parameter('chip', '')
diff --git a/modules/core/test.py b/modules/core/test.py
index ef0dde6..c88ccf4 100644
--- a/modules/core/test.py
+++ b/modules/core/test.py
@@ -7,7 +7,7 @@ import core.widget
 import core.module
 
 class Module(core.module.Module):
-    def __init__(self, config=None):
+    def __init__(self, config):
         super().__init__(config, core.widget.Widget('test'))
 
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4
diff --git a/modules/core/xrandr.py b/modules/core/xrandr.py
index 2145bea..a62e0f5 100644
--- a/modules/core/xrandr.py
+++ b/modules/core/xrandr.py
@@ -33,7 +33,7 @@ except:
     pass
 
 class Module(core.module.Module):
-    def __init__(self, config=None):
+    def __init__(self, config):
         widgets = []
         super().__init__(config, widgets)
 
diff --git a/tests/modules/test_kernel.py b/tests/modules/test_kernel.py
index eeeb73d..bef3472 100644
--- a/tests/modules/test_kernel.py
+++ b/tests/modules/test_kernel.py
@@ -1,11 +1,12 @@
 import unittest
 
+import core.config
 import modules.core.kernel
 
 class kernel(unittest.TestCase):
     def setUp(self):
         self.someKernel = 'this-is-my-kernel'
-        self.module = modules.core.kernel.Module()
+        self.module = modules.core.kernel.Module(config=core.config.Config([]))
 
     def test_full_text(self):
         with unittest.mock.patch('modules.core.kernel.platform') as platform: