diff --git a/python-zstandard.spec b/python-zstandard.spec
index e7db751..d4125ad 100644
--- a/python-zstandard.spec
+++ b/python-zstandard.spec
@@ -58,13 +58,20 @@ mv zstandard{,.src}
 export ZSTD_SLOW_TESTS=1
 %pytest -v\
 %ifarch s390x
-        -k 'not test_constant_methods\
+        -k "not test_constant_methods\
         and not test_no_context_manager\
         and not test_read_closed\
         and not test_close\
         and not test_read_after_exit\
         and not test_read_buffer\
-        and not test_read_stream'\
+        and not test_read_stream\
+        and not test_read_binary_filename\
+        and not test_read_binary_fileobj\
+        and not test_read_text_filename\
+        and not test_read_text_fileobj\
+        and not test_write_binary_filename\
+        and not test_write_binary_fileobj\
+        and not test_write_text_filename"\
 %endif
         --numprocesses=auto
 mv zstandard{.src,}
@@ -80,7 +87,7 @@ mv zstandard{.src,}
 * Wed Feb 03 2021 Dominik Mierzejewski <dominik@greysector.net> 0.15.1-1
 - update to 0.15.1 (#1924620)
 - work around weird test failure
-- fix tests on i686
+- fix tests on i686 and s390x
 
 * Wed Jul 29 2020 Fedora Release Engineering <releng@fedoraproject.org> - 0.13.0-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild