diff --git a/firmware/esp32/overland-controller/config.h b/firmware/esp32/overland-controller/config.h
index 0255226..6192a43 100644
--- a/firmware/esp32/overland-controller/config.h
+++ b/firmware/esp32/overland-controller/config.h
@@ -14,7 +14,7 @@
 #define RELAY_SHIFT_REGISTER_PIN 255
 
 // GPIO4 is used by the LilyGO relay shift-register OE pin.
-#define ONEWIRE_PIN 14
+#define ONEWIRE_PIN 21
 
 #define IGNITION_PIN 34