diff --git a/live-build/functions b/live-build/functions
index 551a3c35..ec6d15a7 100644
--- a/live-build/functions
+++ b/live-build/functions
@@ -276,8 +276,9 @@ replace_grub_root_with_label() {
     CHROOT_ROOT="$1"
 
     # If boot by partuuid has been requested, don't override.
-    if [ -f $CHROOT_ROOT/etc/default/grub.d/40-partuuid.cfg ] && \
-           grep -q ^GRUB_FORCE_PARTUUID= $CHROOT_ROOT/etc/default/grub.d/40-partuuid.cfg; then
+    if [ -f $CHROOT_ROOT/etc/default/grub.d/40-force-partuuid.cfg ] && \
+           grep -q ^GRUB_FORCE_PARTUUID= $CHROOT_ROOT/etc/default/grub.d/40-force-partuuid.cfg
+    then
         return 0
     fi
     sed -i -e "s,root=[^ ]\+,root=LABEL=${fs_label}," \