diff --git a/firmware/boards/f0_module/port.cpp b/firmware/boards/f0_module/port.cpp
index 8ead22a..e49ead1 100644
--- a/firmware/boards/f0_module/port.cpp
+++ b/firmware/boards/f0_module/port.cpp
@@ -146,7 +146,7 @@ SensorType GetSensorType()
     return SensorType::LSU49;
 }
 
-void SetupESRDriver(SensorType sensor)
+void SetupESRDriver(SensorType)
 {
     // NOP
 }
@@ -157,8 +157,7 @@ int GetESRSupplyR()
     return 22000;
 }
 
-void ToggleESRDriver(SensorType sensor)
+void ToggleESRDriver(SensorType)
 {
-    (void)sensor;
     palTogglePad(NERNST_49_ESR_DRIVER_PORT, NERNST_49_ESR_DRIVER_PIN);
 }
diff --git a/firmware/boards/port.h b/firmware/boards/port.h
index 9022bd7..902a637 100644
--- a/firmware/boards/port.h
+++ b/firmware/boards/port.h
@@ -60,7 +60,7 @@ public:
         } __attribute__((packed));
 
         // pad to 256 bytes including tag
-        uint8_t pad[256 - 4];
+        uint8_t pad[256 - sizeof(Tag)];
     };
 };