diff --git a/pyunifi/controller.py b/pyunifi/controller.py
index aafc9a2..a2296b4 100644
--- a/pyunifi/controller.py
+++ b/pyunifi/controller.py
@@ -398,7 +398,7 @@ def _switch_port_power(self, target_mac, port_idx, mode):
         overrides = device_stat.get("port_overrides")
         found = False
         if overrides:
-            for i in overrides:
+            for i in range(len(overrides)):
                 if overrides[i]["port_idx"] == port_idx:
                     # Override already exists, update..
                     overrides[i]["poe_mode"] = mode