diff --git a/boards/mro/ctrl-zero-h7-oem/src/i2c.cpp b/boards/mro/ctrl-zero-h7-oem/src/i2c.cpp
index de6742ac58..1b8927c699 100644
--- a/boards/mro/ctrl-zero-h7-oem/src/i2c.cpp
+++ b/boards/mro/ctrl-zero-h7-oem/src/i2c.cpp
@@ -35,6 +35,6 @@
 
 constexpr px4_i2c_bus_t px4_i2c_buses[I2C_BUS_MAX_BUS_ITEMS] = {
 	initI2CBusExternal(1),
-	initI2CBusInternal(3),
+	initI2CBusExternal(3),
 	initI2CBusExternal(4),
 };