diff --git a/kokkos.spec b/kokkos.spec
index f3e9624..169ab69 100644
--- a/kokkos.spec
+++ b/kokkos.spec
@@ -1,14 +1,12 @@
-%undefine __cmake_in_source_build
-
 Name:           kokkos
 Version:        3.1.01
 %global         sover 3.1.1
-Release:        3%{?dist}
-Summary:        Kokkos C++ Performance Portability Programming 
-#no support for 32-bit archs https://github.com/kokkos/kokkos/issues/2312
+Release:        4%{?dist}
+Summary:        Kokkos C++ Performance Portability Programming
+# no support for 32-bit archs https://github.com/kokkos/kokkos/issues/2312
 ExcludeArch: i686 armv7hl
 
-License:        BSD 
+License:        BSD
 URL:            https://github.com/kokkos/kokkos
 Source0:        https://github.com/kokkos/kokkos/archive/%{version}.tar.gz#/%{name}-%{version}.tar.gz
 
@@ -55,7 +53,11 @@ This package contains the development files of %{name}.
 %cmake3_install
 
 %check
-%ctest3
+# https://github.com/kokkos/kokkos/issues/2959 - unstable test
+%ifarch s390x
+%global testargs --exclude-regex KokkosCore_UnitTest_StackTraceTest
+%endif
+%ctest3 %{?testargs}
 
 %files
 %doc README.md
@@ -69,6 +71,9 @@ This package contains the development files of %{name}.
 %{_bindir}/nvcc_wrapper
 
 %changelog
+* Mon Aug 03 2020 Christoph Junghans <junghans@votca.org> - 3.1.01-4
+- Fix out-of-source build on F33 (bug #1863948)
+
 * Sat Aug 01 2020 Fedora Release Engineering <releng@fedoraproject.org> - 3.1.01-3
 - Second attempt - Rebuilt for
   https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild