diff --git a/autoconf-el.changes b/autoconf-el.changes
index bdc5a4b..aa33b87 100644
--- a/autoconf-el.changes
+++ b/autoconf-el.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Wed Mar 15 12:29:24 UTC 2017 - dimstar@opensuse.org
+
+- Also BuildRequire m4 for autoconf-el: it was wrongly assumed that
+  the two spec files would be in sync (but pre_checkin only syncs
+  the Version: and .changes file).
+
 -------------------------------------------------------------------
 Thu Feb  9 12:12:26 UTC 2017 - dimstar@opensuse.org
 
diff --git a/autoconf-el.spec b/autoconf-el.spec
index 65d58f4..62ad2d0 100644
--- a/autoconf-el.spec
+++ b/autoconf-el.spec
@@ -18,6 +18,7 @@
 
 Name:           autoconf-el
 BuildRequires:  emacs-nox
+BuildRequires:  m4 >= 1.4.6
 BuildRequires:  xz
 Version:        2.69
 Release:        0
diff --git a/autoconf-testsuite.changes b/autoconf-testsuite.changes
index bdc5a4b..aa33b87 100644
--- a/autoconf-testsuite.changes
+++ b/autoconf-testsuite.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Wed Mar 15 12:29:24 UTC 2017 - dimstar@opensuse.org
+
+- Also BuildRequire m4 for autoconf-el: it was wrongly assumed that
+  the two spec files would be in sync (but pre_checkin only syncs
+  the Version: and .changes file).
+
 -------------------------------------------------------------------
 Thu Feb  9 12:12:26 UTC 2017 - dimstar@opensuse.org
 
diff --git a/autoconf.changes b/autoconf.changes
index bdc5a4b..aa33b87 100644
--- a/autoconf.changes
+++ b/autoconf.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Wed Mar 15 12:29:24 UTC 2017 - dimstar@opensuse.org
+
+- Also BuildRequire m4 for autoconf-el: it was wrongly assumed that
+  the two spec files would be in sync (but pre_checkin only syncs
+  the Version: and .changes file).
+
 -------------------------------------------------------------------
 Thu Feb  9 12:12:26 UTC 2017 - dimstar@opensuse.org