diff --git a/drivers/include/periph/i2c.h b/drivers/include/periph/i2c.h
index d08cd8f4af..2f13e2a4a4 100644
--- a/drivers/include/periph/i2c.h
+++ b/drivers/include/periph/i2c.h
@@ -29,7 +29,7 @@
  * // before accessing the bus, we need to acquire it
  * i2c_acquire(dev);
  * // next we write the register address, but create no STOP condition when done
- * i2c_write_byte(dev, device_addr, reg_addr, (i2C_NOSTOP | I2C_ADDR10));
+ * i2c_write_byte(dev, device_addr, reg_addr, (I2C_NOSTOP | I2C_ADDR10));
  * // and now we read the register value
  * i2c_read_byte(dev, device_addr, &reg_value, I2C_ADDR10);
  * // finally we have to release the bus
@@ -425,4 +425,4 @@ int i2c_write_regs(i2c_t dev, uint16_t addr, uint16_t reg,
 #endif
 
 #endif /* PERIPH_I2C_H */
-/** @} */
\ No newline at end of file
+/** @} */