diff --git a/chrony.spec b/chrony.spec
index 11f67f6..a2cb878 100644
--- a/chrony.spec
+++ b/chrony.spec
@@ -299,6 +299,9 @@ find %{buildroot} -type f | xargs sed -i '
 export CLKNETSIM_RANDOM_SEED=24501
 export CFLAGS="%{optflags}"
 make %{?_smp_mflags} -C test/simulation/clknetsim
+pushd test/simulation
+./124-tai
+popd
 make %{?_smp_mflags} quickcheck
 %endif
 %endif