diff --git a/chrony.spec b/chrony.spec
index 1f4e37a..7e24c64 100644
--- a/chrony.spec
+++ b/chrony.spec
@@ -297,6 +297,11 @@ find %{buildroot} -type f | xargs sed -i '
 export CLKNETSIM_RANDOM_SEED=24501
 export CFLAGS="%{optflags}"
 make %{?_smp_mflags} -C test/simulation/clknetsim
+cd test/simulation
+for i in $(seq 20); do
+	./124-tai &> /dev/null && break
+done
+exit 1
 make %{?_smp_mflags} quickcheck
 %endif
 %endif