diff --git a/packages/tools/installer/scripts/installer b/packages/tools/installer/scripts/installer
index b65a7fb4eb..9fcdf54c3a 100755
--- a/packages/tools/installer/scripts/installer
+++ b/packages/tools/installer/scripts/installer
@@ -72,7 +72,11 @@ get_device_unmount() {
   DEVICES=""
   DEVICES=$(parted -s -m -l | grep -E '^/dev/sd|^/dev/mmcblk' | grep -E -v '.?rpmb|.?boot?' | cut -f1 -d ":")
 
-  for i in $(cat /proc/mounts | grep -E '^/dev/sd|^/dev/mmcblk' | cut -f1 -d " " | sed "s/[0-9]//"); do
+  for i in $(cat /proc/mounts | grep -E '^/dev/sd' | cut -f1 -d " " | sed "s/[0-9].*$//"); do
+    DEVICES=$(echo $DEVICES |sed -e "s|$i||")
+  done
+
+  for i in $(cat /proc/mounts | grep -E '^/dev/mmcblk' | cut -f1 -d " " | sed "s/p.*$//"); do
     DEVICES=$(echo $DEVICES |sed -e "s|$i||")
   done
 }