diff --git a/libsigc++2.changes b/libsigc++2.changes
index 3f73c42..06bd66c 100644
--- a/libsigc++2.changes
+++ b/libsigc++2.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Thu Feb  9 14:03:31 UTC 2017 - dimstar@opensuse.org
+
+- Explicitly BuildRequire m4
+
 -------------------------------------------------------------------
 Mon Dec  5 14:23:11 UTC 2016 - jengelh@inai.de
 
diff --git a/libsigc++2.spec b/libsigc++2.spec
index 3aa97ad..d096aab 100644
--- a/libsigc++2.spec
+++ b/libsigc++2.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package libsigc++2
 #
-# Copyright (c) 2016 SUSE LINUX GmbH, Nuernberg, Germany.
+# Copyright (c) 2017 SUSE LINUX GmbH, Nuernberg, Germany.
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -29,6 +29,7 @@ Source99:       baselibs.conf
 # PATCH-FIX-OPENSUSE libsigc++-std-c11.patch dimstar@opensuse.org -- Add -std=c11 to CFLAGS when using libsigc++ to build. This is not upstreamable in this form as the used CXX macro should handle that, so needs more work (and entry points in mm-common)
 Patch0:         libsigc++-std-c11.patch
 BuildRequires:  gcc-c++
+BuildRequires:  m4
 BuildRequires:  pkg-config
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build