diff --git a/debian/changelog b/debian/changelog
index 7298ba3aa..eb817baf3 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -4,6 +4,8 @@ grub2 (2.06-13) UNRELEASED; urgency=medium
   * When *also* installing to the removable media path, include the
     relevant mokmanager binary. Closes: #1034409
 
+  [ General Chaos ]
+  * Allow initrd to contain spaces. Closes: #838177, #820838.
 
  -- Steve McIntyre <93sam@debian.org>  Sun, 23 Apr 2023 20:55:54 +0100
 
diff --git a/debian/patches/os-prober-Allow-initrd-to-contain-spaces.patch b/debian/patches/os-prober-Allow-initrd-to-contain-spaces.patch
new file mode 100644
index 000000000..eb6c452e4
--- /dev/null
+++ b/debian/patches/os-prober-Allow-initrd-to-contain-spaces.patch
@@ -0,0 +1,50 @@
+From 1f982e2a7c35e14d5a92c76db998afafd1bd9e87 Mon Sep 17 00:00:00 2001
+From: General Chaos <debianbugs@toeai.com>
+Date: Tue, 12 Apr 2016 22:28:52 +0000
+Subject: [PATCH] os-prober: Allow initrd to contain spaces
+
+linux-boot-prober produces structured output with newline-terminated rows
+representing kernels, each with colon-delimited columns. We translate
+this into a sequence of space-separated words representing kernels,
+each containing colon-delimited fields where spaces are represented by
+carets.
+
+When we parse each of those words into colon-delimited fields, if the
+field could conceivably contain spaces then we need to translate
+carets back into spaces. We did this for label and parameters, but not
+for the initrd.
+
+In particular, when CPU microcode is installed on Arch Linux or its
+derivatives, they write CPU microcode into one initrd archive and the
+rest of early user-space into another, instead of concatenating the
+archives into a single file like Debian derivatives do. To boot Arch
+successfully from the grub menu, we need to add all of their initrds
+to the grub menu entry (detecting this situation requires an os-prober
+patch, for which see <https://bugs.debian.org/820838>).
+
+[Commit message added by Simon McVittie <smcv@collabora.com>]
+
+Bug: https://savannah.gnu.org/bugs/index.php?47681
+Bug-Debian: https://bugs.debian.org/838177
+Forwarded: https://savannah.gnu.org/bugs/index.php?47681
+Closes: #838177
+---
+ util/grub.d/30_os-prober.in | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/util/grub.d/30_os-prober.in b/util/grub.d/30_os-prober.in
+index da5f28876..d0609d9a4 100644
+--- a/util/grub.d/30_os-prober.in
++++ b/util/grub.d/30_os-prober.in
+@@ -243,7 +243,7 @@ EOF
+         LBOOT="`echo ${LINUX} | cut -d ':' -f 2`"
+         LLABEL="`echo ${LINUX} | cut -d ':' -f 3 | tr '^' ' '`"
+         LKERNEL="`echo ${LINUX} | cut -d ':' -f 4`"
+-        LINITRD="`echo ${LINUX} | cut -d ':' -f 5`"
++        LINITRD="`echo ${LINUX} | cut -d ':' -f 5 | tr '^' ' '`"
+         LPARAMS="`echo ${LINUX} | cut -d ':' -f 6- | tr '^' ' '`"
+ 
+         if [ -z "${LLABEL}" ] ; then
+-- 
+2.32.0
+
diff --git a/debian/patches/series b/debian/patches/series
index 937f5072c..96b3f196a 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -120,3 +120,4 @@ osdep-devmapper-getroot-have-devmapper-recognize-luks2.patch
 osdep-devmapper-getroot-set-up-cheated-luks2-cryptodisk-mount-from-dm-parameters.patch
 arm64-handover-to-kernel-if-sb-enabled.patch
 grub_os-prober.patch
+os-prober-Allow-initrd-to-contain-spaces.patch