diff --git a/libraries/AP_HAL_PX4/I2CDevice.cpp b/libraries/AP_HAL_PX4/I2CDevice.cpp
index 35d8e7a925..34a9ed161a 100644
--- a/libraries/AP_HAL_PX4/I2CDevice.cpp
+++ b/libraries/AP_HAL_PX4/I2CDevice.cpp
@@ -27,7 +27,7 @@ uint8_t PX4::PX4_I2C::instance;
   constructor for I2C wrapper class
  */    
 PX4_I2C::PX4_I2C(uint8_t bus) :
-  I2C(devname, devpath, map_bus_number(bus), 0, 400000UL)
+  I2C(devname, devpath, map_bus_number(bus), 0, 100000UL)
 {}
 
 /*