diff --git a/inc/drivers/MicroBitCompass.h b/inc/drivers/MicroBitCompass.h
index f82e26f..0f4527e 100644
--- a/inc/drivers/MicroBitCompass.h
+++ b/inc/drivers/MicroBitCompass.h
@@ -196,7 +196,7 @@ class MicroBitCompass : public MicroBitComponent
          *
          * @return MICROBIT_OK on success, MICROBIT_I2C_ERROR if the compass could not be configured.
          */
-        int configure();
+        virtual int configure();
 
         /**
          *
diff --git a/source/drivers/LSM303Magnetometer.cpp b/source/drivers/LSM303Magnetometer.cpp
index abd0c83..d67b873 100644
--- a/source/drivers/LSM303Magnetometer.cpp
+++ b/source/drivers/LSM303Magnetometer.cpp
@@ -68,7 +68,7 @@ int LSM303Magnetometer::configure()
         return MICROBIT_I2C_ERROR;
 
     // Enable Data Ready interrupt, with buffering of data to avoid race conditions.
-    result = i2c.writeRegister(address, LSM303_CFG_REG_C_M, 0x41);
+    result = i2c.writeRegister(address, LSM303_CFG_REG_C_M, 0x01);
     if (result != MICROBIT_OK)
         return MICROBIT_I2C_ERROR;
 
@@ -115,7 +115,7 @@ int LSM303Magnetometer::requestUpdate()
     }
 
     // Poll interrupt line from device (ACTIVE LO)
-    if(!int1.getDigitalValue())
+    if(int1.getDigitalValue())
     {
         uint8_t data[6];
         int result;