diff --git a/firmware/SparkFunRHT03.h b/firmware/SparkFunRHT03.h
index 812b345..6abbf16 100644
--- a/firmware/SparkFunRHT03.h
+++ b/firmware/SparkFunRHT03.h
@@ -31,9 +31,9 @@ class RHT03
     int _humidity;
     int _temperature;
     
-	enum class dataByteLocations : unsigned char { HUMIDITY_H, HUMIDITY_L, TEMP_H, TEMP_L, CHECKSUM };
+    enum dataByteLocations { HUMIDITY_H, HUMIDITY_L, TEMP_H, TEMP_L, CHECKSUM };
     
-	bool checksum(byte check, byte * data, const unsigned int datalen);
+	bool checksum(byte check, const byte * data, const unsigned int datalen);
 	int errorExit(const int code);
 	bool waitForRHT(const int pinState, const unsigned int timeout = 1000);
 };