diff --git a/src/main/target/MICOAIR743/CMakeLists.txt b/src/main/target/MICOAIR743/CMakeLists.txt
index 1d38163878..6847f3daef 100644
--- a/src/main/target/MICOAIR743/CMakeLists.txt
+++ b/src/main/target/MICOAIR743/CMakeLists.txt
@@ -1 +1,2 @@
-target_stm32h743xi(MICOAIR743)
\ No newline at end of file
+target_stm32h743xi(MICOAIR743)
+target_stm32h743xi(MICOAIR743_EXTMAG)
diff --git a/src/main/target/MICOAIR743/target.h b/src/main/target/MICOAIR743/target.h
index 52ebef24e1..526cf438d0 100644
--- a/src/main/target/MICOAIR743/target.h
+++ b/src/main/target/MICOAIR743/target.h
@@ -100,7 +100,14 @@
 #define BARO_I2C_BUS            BUS_I2C2
 
 #define USE_MAG
+
+#ifdef MICOAIR743_EXTMAG
+// External compass
+#define MAG_I2C_BUS             BUS_I2C1
+#else
+// Onboard compass
 #define MAG_I2C_BUS             BUS_I2C2
+#endif
 #define USE_MAG_ALL
 
 // *************** ENABLE OPTICAL FLOW & RANGEFINDER *****************************