diff --git a/thunderbird.spec b/thunderbird.spec
index 45b0dae..edf82f1 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -73,6 +73,7 @@ BuildRequires:  hunspell-devel
 BuildRequires:  sqlite-devel >= %{sqlite_version}
 BuildRequires:  startup-notification-devel
 BuildRequires:  alsa-lib-devel
+BuildRequires:  autoconf213
 
 Requires:       mozilla-filesystem
 Requires:       nspr >= %{nspr_version}