diff --git a/netcdf.spec b/netcdf.spec
index f355580..4f34ede 100644
--- a/netcdf.spec
+++ b/netcdf.spec
@@ -1,6 +1,6 @@
 Name:           netcdf
 Version:        4.7.3
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Libraries for the Unidata network Common Data Form
 
 License:        NetCDF
@@ -239,7 +239,8 @@ fail=1
 make -C build check || ( cat build/*/test-suite.log && exit $fail )
 # Allow openmpi to run with more processes than cores
 export OMPI_MCA_rmaps_base_oversubscribe=1
-# mpich test hanging on s390x
+# Work around UCX segfault issue - https://github.com/openucx/ucx/issues/5535
+export UCX_TCP_PUT_ENABLE=n
 for mpi in %{mpi_list}
 do
   module load mpi/$mpi-%{_arch}
@@ -338,6 +339,9 @@ done
 
 
 %changelog
+* Sun Sep  6 2020 Orion Poplawski <orion@nwra.com> - 4.7.3-4
+- Work around UCX segfault issue (FTBFS bz#1864189)
+
 * Sat Aug 01 2020 Fedora Release Engineering <releng@fedoraproject.org> - 4.7.3-3
 - Second attempt - Rebuilt for
   https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild