diff --git a/mysql8.4.spec b/mysql8.4.spec
index 569662a..edc799f 100644
--- a/mysql8.4.spec
+++ b/mysql8.4.spec
@@ -760,11 +760,12 @@ pushd %_vpath_builddir
 #make test VERBOSE=1
 pushd mysql-test
 cp ../../mysql-test/%{skiplist} .
-
 (
   set -ex
   cd %{buildroot}%{_datadir}/mysql-test
 
+  export MTR_MAX_PARALLEL=16
+
   export common_testsuite_arguments=" %{?with_debug:--debug-server} \
                                      --force --skip-combinations --report-unstable-tests --clean-vardir --nocheck-testcases \
                                      --suite-timeout=900 --testcase-timeout=30 --port-base=$(( $(date +%s) % 20000 + 10000 )) \