diff --git a/python-cffi.spec b/python-cffi.spec
index 626e2b0..6de9784 100644
--- a/python-cffi.spec
+++ b/python-cffi.spec
@@ -26,6 +26,8 @@ Group:          Development/Languages/Python
 URL:            http://cffi.readthedocs.org
 Source0:        https://files.pythonhosted.org/packages/source/c/cffi/cffi-%{version}.tar.gz
 Source1:        python-cffi-rpmlintrc
+Source2:        test_cos_01.py
+Source3:        test_cos_02.py
 # https://bitbucket.org/cffi/cffi/issues/384/
 Patch0:         e2e324a2f13e3a646de6f6ff03e90ed7d37e2636.patch
 # https://bitbucket.org/cffi/cffi/issues/378
@@ -50,6 +52,9 @@ is to provide a convenient and reliable way of calling C code from Python.
 %setup -q -n cffi-%{version}
 %autopatch -p1
 
+cp -v -p %{SOURCE2} .
+cp -v -p %{SOURCE3} .
+
 %build
 export CFLAGS="%{optflags}"
 %python_build
@@ -59,7 +64,14 @@ export CFLAGS="%{optflags}"
 %python_expand %fdupes %{buildroot}%{$python_sitearch}
 
 %check
-%python_expand PYTHONPATH=%{buildroot}%{$python_sitearch} py.test-%$python_bin_suffix -W ignore::UserWarning c/ testing/
+# https://bitbucket.org/cffi/cffi/issues/390/
+%{python_expand PYTHONPATH=%{buildroot}%{$python_sitearch}
+py.test-%$python_bin_suffix -k test_dlopen_filename -W ignore::UserWarning c/ testing/
+echo "Testing test_cos_01.py"
+%python_exec test_cos_01.py
+echo "Testing test_cos_02.py"
+%python_exec test_cos_02.py
+}
 
 %files %{python_files}
 %license LICENSE
diff --git a/test_cos_01.py b/test_cos_01.py
new file mode 100644
index 0000000..216d4f5
--- /dev/null
+++ b/test_cos_01.py
@@ -0,0 +1,6 @@
+import cffi, ctypes.util
+ctypes.util.find_library('m')
+ffi = cffi.FFI()
+ffi.cdef("double cos(double);")
+print(ffi.dlopen('m').cos(1.23))
+print(ffi.dlopen('libm.so.6').cos(1.23))
diff --git a/test_cos_02.py b/test_cos_02.py
new file mode 100644
index 0000000..023f2fc
--- /dev/null
+++ b/test_cos_02.py
@@ -0,0 +1,6 @@
+import cffi, ctypes.util
+ctypes.util.find_library('m')
+ffi = cffi.FFI()
+ffi.cdef("double cos(double);")
+print(ffi.dlopen('libm.so.6').cos(1.23))
+print(ffi.dlopen('m').cos(1.23))