diff --git a/ROMFS/px4fmu_common/init.d/rc.sensors b/ROMFS/px4fmu_common/init.d/rc.sensors
index 2d01f50a83..d523ef4791 100644
--- a/ROMFS/px4fmu_common/init.d/rc.sensors
+++ b/ROMFS/px4fmu_common/init.d/rc.sensors
@@ -9,6 +9,11 @@ then
 	then
 	fi
 else
+	# Configure all I2C buses to 100 KHz as they
+	# are all external or slow
+	fmu i2c 1 100000
+	fmu i2c 2 100000
+
 	if ms5611 -s start
 	then
 	fi