diff --git a/src/main/target/SPEEDYBEEF4/target.h b/src/main/target/SPEEDYBEEF4/target.h
index 183492c42b..3920653df7 100644
--- a/src/main/target/SPEEDYBEEF4/target.h
+++ b/src/main/target/SPEEDYBEEF4/target.h
@@ -170,3 +170,5 @@
 #define TARGET_IO_PORTB         0xffff
 #define TARGET_IO_PORTC         0xffff
 #define TARGET_IO_PORTD         (BIT(2))
+
+#define RANGEFINDER_I2C_BUS BUS_I2C1
\ No newline at end of file