diff --git a/grubby-bls b/grubby-bls
index 2d59de7..ac82950 100755
--- a/grubby-bls
+++ b/grubby-bls
@@ -500,7 +500,7 @@ update_bls_fragment() {
             if [[ -n $old_args ]]; then
                 opts="$(update_args "${old_args}" "${remove_args}" "${add_args}")"
                 opts="$(echo "$opts" | sed -e 's/\//\\\//g')"
-                sed -i -e "s/^GRUB_CMDLINE_LINUX.*/GRUB_CMDLINE_LINUX=\\\"${opts}\\\"/" "${grub_etc_default}"
+                sed -i -e "s/^GRUB_CMDLINE_LINUX=.*/GRUB_CMDLINE_LINUX=\\\"${opts}\\\"/" "${grub_etc_default}"
             fi
         fi
 
diff --git a/grubby.spec b/grubby.spec
index a82fe14..f4bac16 100644
--- a/grubby.spec
+++ b/grubby.spec
@@ -3,7 +3,7 @@
 
 Name: grubby
 Version: 8.40
-Release: 72%{?dist}
+Release: 73%{?dist}
 Summary: Command line tool for updating bootloader configs
 License: GPL-2.0-or-later
 Source1: grubby-bls
@@ -74,6 +74,9 @@ fi
 %{_mandir}/man8/grubby.8*
 
 %changelog
+* Wed Jan 10 2024 Marta Lewandowska <mlewando@redhat.com> - 8.40-73
+- Do not overwrite all vars that start with GRUB_CMDLINE_LINUX
+
 * Mon Sep 11 2023 Zbigniew Jedrzejewski-Szmek <zbyszek@in.waw.pl> - 8.40-72
 - Drop installkernel so that it can be provided by systemd