diff --git a/baselibs.conf b/baselibs.conf
new file mode 100644
index 0000000..ee8fd3f
--- /dev/null
+++ b/baselibs.conf
@@ -0,0 +1 @@
+libmbedtls9
diff --git a/mbedtls.changes b/mbedtls.changes
index 8ad4695..a9a04c9 100644
--- a/mbedtls.changes
+++ b/mbedtls.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Jul 29 10:16:37 UTC 2015 - dimstar@opensuse.org
+
+- Add baselibs.conf: build libmbedtls9-32bit, as needed by
+  libbzrtp0-32bit.
+
 -------------------------------------------------------------------
 Mon Jun 15 22:19:07 UTC 2015 - fisiu@opensuse.org
 
diff --git a/mbedtls.spec b/mbedtls.spec
index 760f79e..f4ec67d 100644
--- a/mbedtls.spec
+++ b/mbedtls.spec
@@ -25,6 +25,7 @@ License:        GPL-2.0+
 Group:          Development/Libraries/C and C++
 Url:            https://tls.mbed.org
 Source:         https://tls.mbed.org/download/%{name}-%{version}-gpl.tgz
+Source99:       baselibs.conf
 BuildRequires:  cmake
 BuildRequires:  pkg-config
 BuildRequires:  zlib-devel