diff --git a/0001-src-initialize-keymaps-variable.patch b/0001-src-initialize-keymaps-variable.patch
new file mode 100644
index 0000000..50ac183
--- /dev/null
+++ b/0001-src-initialize-keymaps-variable.patch
@@ -0,0 +1,47 @@
+From 9e36a59c806de3de77c046df0b8c80bd9a0f4863 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?J=C3=A1n=20Tomko?= <jtomko@redhat.com>
+Date: Fri, 23 Apr 2021 15:58:56 +0200
+Subject: [PATCH] src: initialize keymaps variable
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+My clang version 11.0.0 (Fedora 11.0.0-2.fc33) complains:
+../src/virt-viewer-app.c:610:9: error: variable 'keymaps' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
+    if (keymap_string) {
+        ^~~~~~~~~~~~~
+../src/virt-viewer-app.c:614:10: note: uninitialized use occurs here
+    if (!keymaps || g_strv_length(keymaps) == 0) {
+         ^~~~~~~
+../src/virt-viewer-app.c:610:5: note: remove the 'if' if its condition is always true
+    if (keymap_string) {
+    ^~~~~~~~~~~~~~~~~~~
+../src/virt-viewer-app.c:595:27: note: initialize the variable 'keymaps' to silence this warning
+    gchar **key, **keymaps, **valkey, **valuekeys = NULL;
+                          ^
+                           = NULL
+1 error generated.
+
+Initialize the variable to fix the uninitialized use.
+
+Signed-off-by: Ján Tomko <jtomko@redhat.com>
+---
+ src/virt-viewer-app.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/virt-viewer-app.c b/src/virt-viewer-app.c
+index 0095398..de2677c 100644
+--- a/src/virt-viewer-app.c
++++ b/src/virt-viewer-app.c
+@@ -592,7 +592,7 @@ static
+ void virt_viewer_app_set_keymap(VirtViewerApp *self, const gchar *keymap_string)
+ {
+     VirtViewerAppPrivate *priv = virt_viewer_app_get_instance_private(self);
+-    gchar **key, **keymaps, **valkey, **valuekeys = NULL;
++    gchar **key, **keymaps = NULL, **valkey, **valuekeys = NULL;
+     VirtViewerKeyMapping *keyMappingArray, *keyMappingPtr;
+     guint *mappedArray, *ptrMove;
+ 
+-- 
+2.31.1
+
diff --git a/virt-viewer.spec b/virt-viewer.spec
index cdc7425..709d08f 100644
--- a/virt-viewer.spec
+++ b/virt-viewer.spec
@@ -10,12 +10,13 @@
 
 Name: virt-viewer
 Version: 10.0
-Release: 4%{?dist}
+Release: 5%{?dist}
 Summary: Virtual Machine Viewer
 License: GPLv2+
 URL: https://gitlab.com/virt-viewer/virt-viewer
 Source0: https://virt-manager.org/download/sources/%{name}/%{name}-%{version}.tar.xz
 Patch1: 0001-src-avoid-warnings-from-use-of-G_GNUC_FALLTHROUGH.patch
+Patch2: 0001-src-initialize-keymaps-variable.patch
 Requires: openssh-clients
 
 BuildRequires: gcc
@@ -78,6 +79,9 @@ the display, and libvirt for looking up VNC/SPICE server details.
 %{_datadir}/bash-completion/completions/virt-viewer
 
 %changelog
+* Tue Nov 16 2021 Tom Stellard <tstellar@redhat.com> - 10.0-5
+- Backport fix for uninitialized variable
+
 * Wed Aug 11 2021 Daniel P. Berrangé <berrange@redhat.com> - 10.0-4
 - Fix build with newer glib (rhbz#1988037)