diff --git a/x86/unittests.cfg b/x86/unittests.cfg
index 504e04e..3a79151 100644
--- a/x86/unittests.cfg
+++ b/x86/unittests.cfg
@@ -334,6 +334,7 @@
 extra_params = -cpu kvm64,hv_time
 arch = x86_64
 groups = hyperv
+check = /sys/devices/system/clocksource/clocksource0/current_clocksource=tsc
 
 [intel_iommu]
 file = intel-iommu.flat