diff --git a/0001-clutter-actor-Set-a-minimum-guessed-scale.patch b/0001-clutter-actor-Set-a-minimum-guessed-scale.patch
new file mode 100644
index 0000000..acc2a77
--- /dev/null
+++ b/0001-clutter-actor-Set-a-minimum-guessed-scale.patch
@@ -0,0 +1,33 @@
+From 552c8cfc0d96f5711dff98327e07ded506a7ecfc Mon Sep 17 00:00:00 2001
+From: Joan Torres <joan.torres@suse.com>
+Date: Mon, 18 Dec 2023 18:33:16 +0100
+Subject: [PATCH] clutter/actor: Set a minimum guessed scale
+
+When running headlessly it fails guessing the scale to -1.0f making
+the assertion g_assert (guessed_scale >= 0.5) fail.
+
+Setting it to 1.f in that case fixes it.
+
+Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3464>
+(cherry picked from commit 3a94822e755e530b71c33bb5bce0e8faa438983c)
+---
+ clutter/clutter/clutter-actor.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/clutter/clutter/clutter-actor.c b/clutter/clutter/clutter-actor.c
+index 64cf291f8b..5a6a009303 100644
+--- a/clutter/clutter/clutter-actor.c
++++ b/clutter/clutter/clutter-actor.c
+@@ -15725,6 +15725,9 @@ clutter_actor_get_real_resource_scale (ClutterActor *self)
+           max_scale = MAX (clutter_stage_view_get_scale (view), max_scale);
+         }
+ 
++      if (max_scale < 0.f)
++        max_scale = 1.f;
++
+       guessed_scale = max_scale;
+     }
+   else
+-- 
+2.54.0
+
diff --git a/mutter.spec b/mutter.spec
index 164e08e..6230982 100644
--- a/mutter.spec
+++ b/mutter.spec
@@ -10,7 +10,7 @@
 
 Name:          mutter
 Version:       40.9
-Release:       32%{?dist}
+Release:       33%{?dist}
 Summary:       Window and compositing manager based on Clutter
 
 License:       GPLv2+
@@ -196,6 +196,9 @@ Patch533: 0001-x11-iconcache-Turn-icons-from-WM_HINTS-pixmaps-to-ca.patch
 # RHEL-68825
 Patch534: 0001-workspace-Sanity-check-input-to-activate.patch
 
+# Avoid assert when headless (RHEL-110674)
+Patch535: 0001-clutter-actor-Set-a-minimum-guessed-scale.patch
+
 BuildRequires: chrpath
 BuildRequires: pango-devel
 BuildRequires: startup-notification-devel
@@ -343,6 +346,10 @@ desktop-file-validate %{buildroot}/%{_datadir}/applications/%{name}.desktop
 %{_datadir}/mutter-%{mutter_api_version}/tests
 
 %changelog
+* Mon May 18 2026 Jonas Ådahl <jadahl@redhat.com> - 40.9-33
+- Avoid assert when headless
+  Resolves: RHEL-110674
+
 * Thu Nov 27 2025 Jonas Ådahl <jadahl@redhat.com> - 40.9-32
 - Sanity check input on workspace activation API
   Related: RHEL-68825