diff --git a/c4ctrl.py b/c4ctrl.py
index 005a949..ab92fae 100755
--- a/c4ctrl.py
+++ b/c4ctrl.py
@@ -350,7 +350,7 @@ class Kitchenlight: # {{{1
         v[14:16] = int(cb.color[0:2], base=16).to_bytes(2, self._END)
         v[16:18] = int(cb.color[2:4], base=16).to_bytes(2, self._END)
         v[18:20] = int(cb.color[4:6], base=16).to_bytes(2, self._END)
-        self._switch(d)
+        self._switch(bytes(d))
 
     def matrix(self, lines=8):
         """ Set to mode "matrix".
@@ -362,7 +362,7 @@ class Kitchenlight: # {{{1
         v = memoryview(d)
         v[0:4] = int(2).to_bytes(4, self._END) # Screen 2
         v[4:8] = int(lines).to_bytes(4, self._END)
-        self._switch(d)
+        self._switch(bytes(d))
 
     def moodlight(self, mode=1):
         """ Set to mode "moodlight".
@@ -397,7 +397,7 @@ class Kitchenlight: # {{{1
             v[9:13] = int(10).to_bytes(4, self._END)
             # Pause
             v[13:17] = int(10000).to_bytes(4, self._END)
-        self._switch(d)
+        self._switch(bytes(d))
 
     def openchaos(self, delay=1000):
         """ Set to mode "openchaos".
@@ -408,7 +408,7 @@ class Kitchenlight: # {{{1
         v = memoryview(d)
         v[0:4] = int(4).to_bytes(4, self._END) # Screen 4
         v[4:8] = int(delay).to_bytes(4, self._END)
-        self._switch(d)
+        self._switch(bytes(d))
 
     def pacman(self):
         """ Set to mode "pacman". """
@@ -441,7 +441,7 @@ class Kitchenlight: # {{{1
         v[4:8] = int(delay).to_bytes(4, self._END)
         v[8:8 + len(text)] = text
         v[len(d) - 1:len(d)] = bytes(1)
-        self._switch(d)
+        self._switch(bytes(d))
 
     def flood(self):
         """ Set to mode "flood". """
@@ -464,7 +464,7 @@ class Kitchenlight: # {{{1
         v[4:8] = int(generations).to_bytes(4, self._END)
         v[8:12] = int(lifetime).to_bytes(4, self._END)
         v[12:16] = int(rainbow).to_bytes(4, self._END)
-        self._switch(d)
+        self._switch(bytes(d))
 # }}}1
 
 class Dmx: # {{{1