diff --git a/mqtt_io/modules/gpio/pcf8574.py b/mqtt_io/modules/gpio/pcf8574.py
index 96ef3df1..51870025 100644
--- a/mqtt_io/modules/gpio/pcf8574.py
+++ b/mqtt_io/modules/gpio/pcf8574.py
@@ -35,7 +35,7 @@ def setup_pin(
         pin_config: ConfigType,
         initial: Optional[str] = None,
     ) -> None:
-        if direction == PinDirection.INPUT and pullup is not None:
+        if direction == PinDirection.INPUT and self.pullup_map[pullup] is not None:
             self.io.port[pin] = self.pullup_map[pullup]
         initial = pin_config.get("initial")
         if initial is not None:
diff --git a/mqtt_io/modules/gpio/pcf8575.py b/mqtt_io/modules/gpio/pcf8575.py
index 988a46a1..d2d95720 100644
--- a/mqtt_io/modules/gpio/pcf8575.py
+++ b/mqtt_io/modules/gpio/pcf8575.py
@@ -35,7 +35,7 @@ def setup_pin(
         pin_config: ConfigType,
         initial: Optional[str] = None,
     ) -> None:
-        if direction == PinDirection.INPUT and pullup is not None:
+        if direction == PinDirection.INPUT and self.pullup_map[pullup] is not None:
             self.io.port[pin] = self.pullup_map[pullup]
         initial = pin_config.get("initial")
         if initial is not None: