diff --git a/baselibs.conf b/baselibs.conf
new file mode 100644
index 0000000..397ed1c
--- /dev/null
+++ b/baselibs.conf
@@ -0,0 +1 @@
+libsrtp1
diff --git a/libsrtp.changes b/libsrtp.changes
index fe21dea..a072772 100644
--- a/libsrtp.changes
+++ b/libsrtp.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Jul 29 09:49:32 UTC 2015 - dimstar@opensuse.org
+
+- Add baselibs.conf: build libsrtp1-32bit, as needed by
+  libmediastreamer_voip4-32bit.
+
 -------------------------------------------------------------------
 Sun Mar 15 16:35:32 UTC 2015 - sor.alexei@meowr.ru
 
diff --git a/libsrtp.spec b/libsrtp.spec
index 4389dd5..a39217c 100644
--- a/libsrtp.spec
+++ b/libsrtp.spec
@@ -26,6 +26,7 @@ Group:          Development/Libraries/C and C++
 Url:            https://github.com/cisco/libsrtp
 #Git-Clone:	git://github.com/cisco/libsrtp
 Source:         https://github.com/cisco/libsrtp/archive/v%{version}.tar.gz#/%{name}-%{version}.tar.gz
+Source99:       baselibs.conf
 BuildRequires:  gcc
 BuildRequires:  pkg-config
 BuildRequires:  pkgconfig(openssl)