diff --git a/lib/psci/psci_common.c b/lib/psci/psci_common.c
index 3bfa068..7c42be7 100644
--- a/lib/psci/psci_common.c
+++ b/lib/psci/psci_common.c
@@ -193,6 +193,7 @@
 	pwrlvl = psci_get_suspend_pwrlvl();
 	if (pwrlvl == PSCI_INVALID_PWR_LVL)
 		pwrlvl = PLAT_MAX_PWR_LVL;
+	assert(pwrlvl < PSCI_INVALID_PWR_LVL);
 	return pwrlvl;
 }