diff --git a/grubby-bls b/grubby-bls
index 0116707..1e8901c 100755
--- a/grubby-bls
+++ b/grubby-bls
@@ -595,17 +595,19 @@ remove_var_prefix() {
 
 update_grubcfg()
 {
-    # Older ppc64le OPAL firmware don't have BLS support so grub2-mkconfig has to be run
-    # to generate a config with menuentry commands.
-    if [ "${arch}" = "ppc64le" ] && [ -d /sys/firmware/opal ]; then
+    # Turn on RUN_MKCONFIG on different archs/scenarios
+    if [[ "${arch}" = 's390' ]] || [[ "${arch}" = 's390x' ]]; then
+        # On s390/s390x systems, run mkconfig/zipl
         RUN_MKCONFIG="true"
-    fi
-
-    # PV and PVH Xen DomU guests boot with pygrub that doesn't have BLS support,
-    # also Xen Dom0 use the menuentries from 20_linux_xen and not the ones from
-    # 10_linux. So grub2-mkconfig has to run for both Xen Dom0 and DomU.
-    if [[ -e /sys/hypervisor/type ]] && grep -q "^xen$" /sys/hypervisor/type; then
+    elif [[ "${arch}" = "ppc64le" ]] && [[ -d /sys/firmware/opal ]]; then
+        # Older ppc64le OPAL firmware don't have BLS support so grub2-mkconfig has to be run
+        # to generate a config with menuentry commands.
+        RUN_MKCONFIG="true"
+    elif [[ -e /sys/hypervisor/type ]] && grep -q "^xen$" /sys/hypervisor/type; then
         if [ ! -e /sys/hypervisor/guest_type ] || ! grep -q "^HVM$" /sys/hypervisor/guest_type; then
+            # PV and PVH Xen DomU guests boot with pygrub that doesn't have BLS support,
+            # also Xen Dom0 use the menuentries from 20_linux_xen and not the ones from
+            # 10_linux. So grub2-mkconfig has to run for both Xen Dom0 and DomU.
             RUN_MKCONFIG=true
         fi
     fi
diff --git a/grubby.spec b/grubby.spec
index a86ffd3..c6e0b42 100644
--- a/grubby.spec
+++ b/grubby.spec
@@ -3,7 +3,7 @@
 
 Name: grubby
 Version: 8.40
-Release: 80%{?dist}
+Release: 81%{?dist}
 Summary: Command line tool for updating bootloader configs
 License: GPL-2.0-or-later
 Source1: grubby-bls
@@ -74,6 +74,11 @@ fi
 %{_mandir}/man8/grubby.8*
 
 %changelog
+* Thu Mar 20 2025 Leo Sandoval <lsandova@redhat.com> - 8.40-81
+- grubby-bls: in s390* systems, run zipl on grub cfg update event
+  Fixes previous commit and formats better the conditions that trigger grub cfg updates
+  Resolves: #RHEL-36092
+
 * Fri Dec 06 2024 Leo Sandoval <lsandova@redhat.com> - 8.40-80
 - grubby-bls: on PPC systems, remove petiboot's version checks
   Resolves: #RHEL-70194