diff --git a/libnacl-1.4.3_bump_libsodium_soversion.patch b/libnacl-1.4.3_bump_libsodium_soversion.patch
new file mode 100644
index 0000000..816e0b7
--- /dev/null
+++ b/libnacl-1.4.3_bump_libsodium_soversion.patch
@@ -0,0 +1,13 @@
+Index: libnacl-1.4.3/libnacl/__init__.py
+===================================================================
+--- libnacl-1.4.3.orig/libnacl/__init__.py
++++ libnacl-1.4.3/libnacl/__init__.py
+@@ -9,7 +9,7 @@ from libnacl.version import __version__
+ import ctypes
+ import sys
+ 
+-__SONAMES = (13, 10, 5, 4)
++__SONAMES = (17, 13, 10, 5, 4)
+ 
+ 
+ def _get_nacl():
diff --git a/python-libnacl.changes b/python-libnacl.changes
index dabc416..2b08675 100644
--- a/python-libnacl.changes
+++ b/python-libnacl.changes
@@ -1,3 +1,24 @@
+-------------------------------------------------------------------
+Thu Nov 19 17:04:26 UTC 2015 - mrueckert@suse.de
+
+- no longer build as noarch package, while the code is still
+  noarch. we actually depend on the native library at runtime. To
+  be able to make this work properly we need to require that native
+  library, that native requires makes us arch dependent.
+
+-------------------------------------------------------------------
+Thu Nov 19 16:28:31 UTC 2015 - mrueckert@suse.de
+
+- make sure we require the libsodium version we were built with
+
+-------------------------------------------------------------------
+Thu Nov 19 16:08:47 UTC 2015 - mrueckert@suse.de
+
+- fix libsodium loading on Tumbleweed: soversion was bumped to 17
+  reported as https://github.com/saltstack/libnacl/pull/60
+
+  adds libnacl-1.4.3_bump_libsodium_soversion.patch
+
 -------------------------------------------------------------------
 Thu Jun 11 20:39:13 UTC 2015 - aboe76@gmail.com
 
diff --git a/python-libnacl.spec b/python-libnacl.spec
index 9e32a3c..e98f298 100644
--- a/python-libnacl.spec
+++ b/python-libnacl.spec
@@ -23,6 +23,7 @@ Summary:        Python bindings for libsodium/tweetnacl based on ctypes
 Url:            https://github.com/saltstack/libnacl
 Group:          Development/Languages/Python
 Source0:        https://pypi.python.org/packages/source/l/libnacl/libnacl-%{version}.tar.gz
+Patch:          libnacl-1.4.3_bump_libsodium_soversion.patch
 BuildRoot:      %{_tmppath}/libnacl-%{version}-build
 
 BuildRequires:  python
@@ -30,11 +31,10 @@ BuildRequires:  python-devel
 BuildRequires:  libsodium-devel
 
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
-%if 0%{?suse_version} && 0%{?suse_version} <= 1110
 %{!?python_sitelib: %global python_sitelib %(python -c "from distutils.sysconfig import get_python_lib; print get_python_lib()")}
-%else
-BuildArch:      noarch
-%endif
+# make sure we require the libsodium version we were built with
+# this is extracted from the requires_eq macro because we need the -a parameter to expand the wildcard in the package name.
+%(LC_ALL=C rpm -q -a --qf "Requires: %%{name}(%{__isa}) = %%{epoch}:%%{version}\n" 'libsodium*' | grep -v libsodium-devel | sed -e 's/ (none):/ /' -e 's/ 0:/ /' | grep -v "is not")
 
 %description
 This library is used to gain direct access to the functions exposed by Daniel J. Bernstein's nacl library via libsodium or tweetnacl.
@@ -43,6 +43,7 @@ in libnacl/__init__.py can be pulled out and placed directly in any project to g
 
 %prep
 %setup -q -n libnacl-%{version}
+%patch -p1
 
 %build
 python setup.py build
@@ -54,4 +55,4 @@ python setup.py install --prefix=%{_prefix} --root=%{buildroot} --optimize=1
 %defattr(-,root,root)
 %{python_sitelib}/*
 
-%changelog
\ No newline at end of file
+%changelog