diff --git a/gnu/local.mk b/gnu/local.mk
index 67be78e17d..6c21b4f4be 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -1580,6 +1580,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/gtk3-respect-GUIX_GTK3_IM_MODULE_FILE.patch \
   %D%/packages/patches/gtk-doc-respect-xml-catalog.patch	\
   %D%/packages/patches/gtk-doc-mkhtml-test-fix.patch	        \
+  %D%/packages/patches/gtk4-demo-reproducible.patch             \
   %D%/packages/patches/gtk4-needs-udmabuf.patch                 \
   %D%/packages/patches/gtk4-respect-GUIX_GTK4_PATH.patch    	\
   %D%/packages/patches/gtkglext-disable-disable-deprecated.patch \
diff --git a/gnu/packages/gtk.scm b/gnu/packages/gtk.scm
index 21ee73c268..4dc00098e7 100644
--- a/gnu/packages/gtk.scm
+++ b/gnu/packages/gtk.scm
@@ -1133,7 +1133,8 @@ application suites.")
        (sha256
         (base32 "1z2mkmazc2d51jbg3qwwdycycqiwswm88nhw6bxscz8j86f5lyyd"))
        (patches
-        (search-patches "gtk4-needs-udmabuf.patch"
+        (search-patches "gtk4-demo-reproducible.patch"
+                        "gtk4-needs-udmabuf.patch"
                         "gtk4-respect-GUIX_GTK4_PATH.patch"))
        (modules '((guix build utils)))))
     (build-system meson-build-system)
diff --git a/gnu/packages/patches/gtk4-demo-reproducible.patch b/gnu/packages/patches/gtk4-demo-reproducible.patch
new file mode 100644
index 0000000000..5b0a194cfa
--- /dev/null
+++ b/gnu/packages/patches/gtk4-demo-reproducible.patch
@@ -0,0 +1,79 @@
+Upstream-status: https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/9675
+
+diff --git a/demos/gtk-demo/geninclude.py b/demos/gtk-demo/geninclude.py
+index 2ebfaeb625..5864a608f5 100755
+--- a/demos/gtk-demo/geninclude.py
++++ b/demos/gtk-demo/geninclude.py
+@@ -2,19 +2,20 @@
+ # -*- coding: utf-8 -*-
+ 
+ import sys
+-import re
+-import os
+ from collections import *
+ 
++
+ def add_quotes(s):
+     return "\"" + s.lower() + "\""
+ 
++
+ def wordify(s):
+     return s.strip().rstrip(".,;:")
+ 
++
+ def is_keyword(s):
+     if s == "GTK":
+-      return False
++        return False
+     elif s.startswith(("Gtk", "Gdk", "Pango")):
+         return True
+     elif s.startswith("G") and s[1].isupper():
+@@ -22,6 +23,7 @@ def is_keyword(s):
+     else:
+         return False
+ 
++
+ out_file = sys.argv[1]
+ in_files = sys.argv[2:]
+ 
+@@ -82,6 +84,10 @@ for demo in demos:
+         parent_index = parent_index + 1
+ 
+ 
++# Sort demos by title
++demos = sorted(demos, key=lambda x: x[1])
++
++
+ # For every child with a parent, generate a list of child demos
+ i = 0
+ for parent in parents:
+@@ -91,15 +97,12 @@ for parent in parents:
+     for child in demos:
+         if child[1].startswith(parent + "/"):
+             title = child[1][child[1].rfind('/') + 1:]
+-            file_output += "  { \"" + child[0] + "\", \"" + title + "\", " + "(const char*[]) {" + ", ".join(list(map(add_quotes, child[2])) + ["NULL"]) + " }, \"" + child[3] + "\", " + child[4] + ", NULL },\n"
++            file_output += "  { \"" + child[0] + "\", \"" + title + "\", " + "(const char*[]) {" + ", ".join(list(map(add_quotes, sorted(child[2]))) + ["NULL"]) + " }, \"" + child[3] + "\", " + child[4] + ", NULL },\n"
+ 
+     file_output += "  { NULL }\n};\n"
+     i = i + 1
+ 
+ 
+-# Sort demos by title
+-demos = sorted(demos, key=lambda x: x[1])
+-
+ file_output += "\nDemoData gtk_demos[] = {\n"
+ for demo in demos:
+     # Do not generate one of these for demos with a parent demo
+@@ -118,10 +121,10 @@ for demo in demos:
+ 
+         if demo[5] != -1:
+             child_array = "child" + str(demo[5])
+-        file_output += "  { " + name + ", " + title + ", " + "(const char*[]) {" + ", ".join(list(map(add_quotes, keywords)) + ["NULL"]) + " }, " + file + ", " + demo[4] + ", " + child_array + " },\n"
++        file_output += "  { " + name + ", " + title + ", " + "(const char*[]) {" + ", ".join(list(map(add_quotes, sorted(keywords))) + ["NULL"]) + " }, " + file + ", " + demo[4] + ", " + child_array + " },\n"
+ 
+-file_output += "  { NULL }\n};\n"
+ 
++file_output += "  { NULL }\n};\n"
+ ofile = open(out_file, "w")
+ ofile.write(file_output)
+ ofile.close()