diff --git a/firmware/config.h b/firmware/config.h
old mode 100644
new mode 100755
index 783d9d2..2274575
--- a/firmware/config.h
+++ b/firmware/config.h
@@ -1,4 +1,7 @@
 
+#ifndef __CONFIG_H__
+#define __CONFIG_H__
+
 #define SENSOR_TEMPERATURE    0
 #define SENSOR_HUMIDITY       1
 #define SENSOR_LIGHT          2
@@ -30,3 +33,6 @@
 #define BME280_ADDRESS 0x76
 
 #define INITIAL_WEBSERVER_TIME 20
+
+#endif
+
diff --git a/firmware/sensors.ino b/firmware/sensors.ino
old mode 100644
new mode 100755
index 03c45da..dc5479f
--- a/firmware/sensors.ino
+++ b/firmware/sensors.ino
@@ -57,4 +57,4 @@ float getBatteryVoltage() {
   float volt = raw / 1023.0;
   return volt * 4.2;
 }
-#endif
+#endif