diff --git a/drivers/power/pm/pm_changestate.c b/drivers/power/pm/pm_changestate.c
index a6ed4702e6a..412edf43f1f 100644
--- a/drivers/power/pm/pm_changestate.c
+++ b/drivers/power/pm/pm_changestate.c
@@ -306,6 +306,7 @@ int pm_changestate(int domain, enum pm_state_e newstate)
 
 enum pm_state_e pm_querystate(int domain)
 {
+  DEBUGASSERT(domain >= 0 && domain < CONFIG_PM_NDOMAINS);
   return g_pmglobals.domain[domain].state;
 }