diff --git a/tools/ak2-core.sh b/tools/ak2-core.sh
index 6114232..55abb1c 100755
--- a/tools/ak2-core.sh
+++ b/tools/ak2-core.sh
@@ -364,7 +364,8 @@ patch_fstab() {
       options) part=$(echo "$entry" | awk '{ print $4 }');;
       flags) part=$(echo "$entry" | awk '{ print $5 }');;
     esac;
-    newentry=$(echo "$entry" | sed "s;${part};${6};");
+    newpart=$(echo "$part" | sed "s;${5};${6};");
+    newentry=$(echo "$entry" | sed "s;${part};${newpart};");
     sed -i "s;${entry};${newentry};" $1;
   fi;
 }