diff --git a/unpaper.spec b/unpaper.spec
index 9fde284..66b274f 100644
--- a/unpaper.spec
+++ b/unpaper.spec
@@ -5,8 +5,9 @@ Summary: A post-processing tool for scanned sheets of paper
 
 License: GPLv2
 URL: https://github.com/unpaper/unpaper
-Source0: %{name}-%{version}.tar.gz
+Source0: https://github.com/unpaper/unpaper/archive/refs/tags/%{name}-%{version}.tar.gz
 
+BuildRequires: autoconf
 BuildRequires: meson
 BuildRequires: sphinx
 Requires: ffmpeg
@@ -24,7 +25,7 @@ of scanned pages before performing optical character recognition
 %setup -q
 
 %build
-autoconf -fis
+%{__autoconf} -fis
 %configure --prefix=%{_prefix}
 %{__make}