diff --git a/Arduino Example Sketches/ADNS9800_SROM_A4.ino b/Arduino Example Sketches/ADNS9800_SROM_A4.ino
index ba96ecc..3c0cffa 100644
--- a/Arduino Example Sketches/ADNS9800_SROM_A4.ino	
+++ b/Arduino Example Sketches/ADNS9800_SROM_A4.ino	
@@ -8,7 +8,7 @@
 const unsigned short firmware_length = 3070;
 
 
-prog_uchar firmware_data[] PROGMEM = {
+const char firmware_data[] PROGMEM = {
 0x03, 0xa4, 0x6e, 0x16, 0x6d, 0x89, 0x3e, 0xfe, 0x5f, 0x1c, 0xb8, 0xf2, 0x47, 0x0c, 0x7b, 
 0x74, 0x6a, 0x56, 0x0f, 0x7d, 0x76, 0x71, 0x4b, 0x0c, 0x97, 0xb6, 0xcf, 0xfd, 0x78, 0x72, 
 0x66, 0x2f, 0xbd, 0xf8, 0x53, 0x24, 0xab, 0xd4, 0x2c, 0xb0, 0xe4, 0x32, 0xf1, 0x6a, 0x56, 
diff --git a/Arduino Example Sketches/ADNS9800test-serial.ino b/Arduino Example Sketches/ADNS9800test-serial.ino
index bbbe547..8bcba20 100644
--- a/Arduino Example Sketches/ADNS9800test-serial.ino	
+++ b/Arduino Example Sketches/ADNS9800test-serial.ino	
@@ -57,7 +57,7 @@ volatile byte movementflag=0;
 const int ncs = 10;
 
 extern const unsigned short firmware_length;
-extern const unsigned char firmware_data[];
+extern const char firmware_data[];
 
 void setup() {
   Serial.begin(9600);
diff --git a/Arduino Example Sketches/ADNS9800testPolling.ino b/Arduino Example Sketches/ADNS9800testPolling.ino
index 6335d53..43117a7 100644
--- a/Arduino Example Sketches/ADNS9800testPolling.ino	
+++ b/Arduino Example Sketches/ADNS9800testPolling.ino	
@@ -58,7 +58,7 @@ volatile byte movementflag=0;
 const int ncs = 10;
 
 extern const unsigned short firmware_length;
-extern const unsigned char firmware_data[];
+extern const char firmware_data[];
 
 void setup() {
   Serial.begin(9600);