diff --git a/debian/patches/build-Remove-redundant-AC_CONFIG_AUX_DIRS.patch b/debian/patches/build-Remove-redundant-AC_CONFIG_AUX_DIRS.patch
new file mode 100644
index 0000000..032b1ee
--- /dev/null
+++ b/debian/patches/build-Remove-redundant-AC_CONFIG_AUX_DIRS.patch
@@ -0,0 +1,35 @@
+From: Simon McVittie <smcv@debian.org>
+Date: Mon, 6 Sep 2021 10:07:46 +0100
+Subject: build: Remove redundant AC_CONFIG_AUX_DIRS
+
+There's an invocation of AC_CONFIG_AUX_DIR(build-scripts) at the top of
+the file, which is sufficient. AC_CONFIG_AUX_DIRS is an undocumented,
+internal version of AC_CONFIG_AUX_DIR that takes a whitespace-separated
+list, instead of a single path to add to the list.
+
+Newer versions of autoconf treat the argument to AC_CONFIG_AUX_DIRS
+as being literal (they do not expand the shell variable), causing
+autoreconf to fail. The argument to AC_CONFIG_AUX_DIR is documented
+to be relative to $srcdir anyway, so there is no need to specify $srcdir
+a second time.
+
+Part of commit 614326ff "autotools build system updates" upstream.
+
+Bug-Debian: https://bugs.debian.org/993157
+Forwarded: not-needed, part of a larger commit upstream
+---
+ configure.in | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/configure.in b/configure.in
+index 240a322..02b97a4 100644
+--- a/configure.in
++++ b/configure.in
+@@ -41,7 +41,6 @@ AC_SUBST(LT_REVISION)
+ AC_SUBST(LT_AGE)
+ 
+ dnl Detect the canonical build and host environments
+-AC_CONFIG_AUX_DIRS($srcdir/build-scripts)
+ dnl AC_CANONICAL_HOST
+ 
+ dnl Check for tools
diff --git a/debian/patches/series b/debian/patches/series
index d2ea396..e576bc5 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -1 +1,2 @@
 0199-Fixed-use-after-free-in-music_fluidsynth.c.patch
+build-Remove-redundant-AC_CONFIG_AUX_DIRS.patch