diff --git a/upgrade4to5 b/upgrade4to5
index a9384b5..76e48b3 100755
--- a/upgrade4to5
+++ b/upgrade4to5
@@ -32,7 +32,11 @@ echo "Changing sources ..."
 sed -i "s/stretch/buster/g" /etc/apt/sources.list
 sed -i "s/stretch/buster/g" /etc/apt/sources.list.d/*
 sed -i "s/arrakis/usul/g" /etc/apt/sources.list.d/*
-sed -i "/[Dd]ocker/d" /etc/apt/sources.list.d/omv*
+for list in /etc/apt/sources.list.d/omvextras.list /etc/apt/sources.list.d/omv-extras-org.list; do
+  if [ -f "${list}" ]; then
+    sed -i "/[Dd]ocker/d" ${list}
+  fi
+done
 
 echo "Applying mtu fix ..."
 sed -i "s/<mtu><\/mtu>/<mtu>0<\/mtu>/g" /etc/openmediavault/config.xml