diff --git a/include/driver/scd4x.h b/include/driver/scd4x.h
index 19ba20d4b16b9f5e1b63eafe23a16e1342dd28ae..d99c4fc7a6b82b22ab26d8a3d04775a207eb1d08 100644
--- a/include/driver/scd4x.h
+++ b/include/driver/scd4x.h
@@ -24,7 +24,6 @@ class SCD4x {
 		void stop();
 
 		void startLowPower();
-		void stopLowPower();
 
 		void read();
 };
diff --git a/src/driver/scd4x.cc b/src/driver/scd4x.cc
index c0901e85f70405d97f9732fe30dd66502c2f8425..3d52975d9798bdac42e6921c7e5f39d20f4bba40 100644
--- a/src/driver/scd4x.cc
+++ b/src/driver/scd4x.cc
@@ -25,6 +25,13 @@ void SCD4x::stop()
 	i2c.xmit(address, 2, txbuf, 0, rxbuf);
 }
 
+void SCD4x::startLowPower()
+{
+	txbuf[0] = 0x21;
+	txbuf[1] = 0xac;
+	i2c.xmit(address, 2, txbuf, 0, rxbuf);
+}
+
 void SCD4x::read()
 {
 	txbuf[0] = 0xec;