diff --git a/usr/share/archboot/installer/setup b/usr/share/archboot/installer/setup
index 972852aec..43d1cd9d5 100755
--- a/usr/share/archboot/installer/setup
+++ b/usr/share/archboot/installer/setup
@@ -721,6 +721,13 @@ _raid()
             k=$(echo $i | sed -e 's#[0-9]##g')
             PARTS=$(echo $PARTS | sed -e "s#$k\ _##g")
         done
+        # skip dmraid devices
+        for i in $(ls /dev/mapper/$(dmraid -s -c)*); do
+            ALREADYINUSE="$ALREADYINUSE $i"
+        done
+        for i in $ALREADYINUSE; do
+            PARTS=$(echo $PARTS | sed -e "s#$i\ _##g")
+        done
         # break if all devices are in use
         if [ "$PARTS" = "" ]; then
             DIALOG --msgbox "All devices in use. No more devices left for new creation." 0 0
@@ -809,6 +816,13 @@ _raidpartitions()
             k=$(echo $i | sed -e 's#[0-9]##g')
             PARTS=$(echo $PARTS | sed -e "s#$k\ _##g")
         done
+        # skip dmraid devices
+        for i in $(ls /dev/mapper/$(dmraid -s -c)*); do
+            ALREADYINUSE="$ALREADYINUSE $i"
+        done
+        for i in $ALREADYINUSE; do
+            PARTS=$(echo $PARTS | sed -e "s#$i\ _##g")
+        done
         # break if all devices are in use
         if [ "$PARTS" = "" ]; then
             DIALOG --msgbox "All devices in use. No more devices left for new creation." 0 0