diff --git a/src/revpimodio2/device.py b/src/revpimodio2/device.py
index 6631e59..f2089e1 100644
--- a/src/revpimodio2/device.py
+++ b/src/revpimodio2/device.py
@@ -531,10 +531,6 @@ class Device(object):
         with self._filelock:
             self._shared_write.clear()
         self._shared_procimg = True if activate else False
-        if self._shared_procimg and self not in self._modio._lst_shared:
-            self._modio._lst_shared.append(self)
-        elif not self._shared_procimg and self in self._modio._lst_shared:
-            self._modio._lst_shared.remove(self)
 
     def syncoutputs(self) -> bool:
         """
diff --git a/src/revpimodio2/helper.py b/src/revpimodio2/helper.py
index d0ae906..f1e9176 100644
--- a/src/revpimodio2/helper.py
+++ b/src/revpimodio2/helper.py
@@ -531,7 +531,9 @@ class ProcimgWriter(Thread):
                 continue
 
             try:
-                for dev in self._modio._lst_shared:
+                for dev in self._modio._lst_refresh:
+                    if not dev._shared_procimg:
+                        continue
                     # Set shared outputs before reading process image
                     for io in dev._shared_write:
                         if not io._write_to_procimg():
diff --git a/src/revpimodio2/modio.py b/src/revpimodio2/modio.py
index b558fd5..67a8fee 100644
--- a/src/revpimodio2/modio.py
+++ b/src/revpimodio2/modio.py
@@ -69,7 +69,6 @@ class RevPiModIO(object):
         "_autorefresh", "_buffedwrite", "_configrsc", "_debug", "_devselect", \
         "_exit", "_exit_level", "_imgwriter", "_ioerror", \
         "_length", "_looprunning", "_lst_devselect", "_lst_refresh", \
-        "_lst_shared", \
         "_maxioerrors", "_monitoring", "_myfh", "_myfh_lck", \
         "_procimg", "_replace_io_file", "_run_on_pi", \
         "_set_device_based_cycle_time", "_simulator", "_shared_procimg", \
@@ -135,7 +134,6 @@ class RevPiModIO(object):
         self._length = 0
         self._looprunning = False
         self._lst_refresh = []
-        self._lst_shared = []
         self._maxioerrors = 0
         self._myfh = None
         self._myfh_lck = Lock()