diff --git a/vala-g_chdir.patch b/vala-g_chdir.patch
new file mode 100644
index 0000000..1d64095
--- /dev/null
+++ b/vala-g_chdir.patch
@@ -0,0 +1,19 @@
+glib-2.0: g_chdir is declared in <glib/gstdio.h>
+
+Not <glib.h>.  Fixes an implicit function error when building deja-dup.
+
+Submitted upstream: <https://gitlab.gnome.org/GNOME/vala/-/merge_requests/310>
+
+diff --git a/vapi/glib-2.0.vapi b/vapi/glib-2.0.vapi
+index 497d6bb6c1714cae..9cfe8bd4c25afcfd 100644
+--- a/vapi/glib-2.0.vapi
++++ b/vapi/glib-2.0.vapi
+@@ -3485,7 +3485,7 @@ namespace GLib {
+ 		[CCode (cname = "g_atexit")]
+ 		public static void atexit (VoidFunc func);
+ 		[Version (since = "2.8")]
+-		[CCode (cname = "g_chdir")]
++		[CCode (cname = "g_chdir", cheader_filename = "glib/gstdio.h")]
+ 		public static int set_current_dir (string path);
+ 	}
+ 
diff --git a/vala.spec b/vala.spec
index da72349..9b0dd24 100644
--- a/vala.spec
+++ b/vala.spec
@@ -3,13 +3,14 @@
 
 Name:           vala
 Version:        0.56.6
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        A modern programming language for GNOME
 
 # Most files are LGPLv2.1+, curses.vapi is 2-clause BSD
 License:        LGPL-2.1-or-later AND BSD-2-Clause
 URL:            https://wiki.gnome.org/Projects/Vala
 Source0:        https://download.gnome.org/sources/%{name}/0.56/%{name}-%{version}.tar.xz
+Patch0: vala-g_chdir.patch
 
 BuildRequires:  bison
 BuildRequires:  flex
@@ -190,6 +191,9 @@ export -n VALAFLAGS
 
 
 %changelog
+* Mon Apr 17 2023 Florian Weimer <fweimer@redhat.com> - 0.56.6-2
+- Fix C header for g_chdir, needed by deja-dup
+
 * Fri Apr 07 2023 David King <amigadave@amigadave.com> - 0.56.6-1
 - Update to 0.56.6