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-rw-r--r--inc/co2-sensor.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/inc/co2-sensor.h b/inc/co2-sensor.h
index 404437a..cc65b32 100644
--- a/inc/co2-sensor.h
+++ b/inc/co2-sensor.h
@@ -33,8 +33,8 @@ void co2_sensor_close(void);
double co2_sensor_value_to_voltage(unsigned int value);
/* Not implemented, please see c source code */
-int co2_sensor_voltage_to_ppm(double voltage);
-int co2_sensor_value_to_ppm(unsigned int value);
+unsigned int co2_sensor_voltage_to_ppm(double voltage);
+unsigned int co2_sensor_value_to_ppm(unsigned int value);
#endif /* __CO2_SENSOR_H__ */