diff --git a/libraries/TFT/src/utility/Adafruit_ST7735.cpp b/libraries/TFT/src/utility/Adafruit_ST7735.cpp
index 4cf084c3b..df91f7d27 100644
--- a/libraries/TFT/src/utility/Adafruit_ST7735.cpp
+++ b/libraries/TFT/src/utility/Adafruit_ST7735.cpp
@@ -100,7 +100,7 @@ void Adafruit_ST7735::writedata(uint8_t c) {
 // formatting -- storage-wise this is hundreds of bytes more compact
 // than the equivalent code.  Companion function follows.
 #define DELAY 0x80
-PROGMEM static prog_uchar
+PROGMEM const static unsigned char
   Bcmd[] = {                  // Initialization commands for 7735B screens
     18,                       // 18 commands in list:
     ST7735_SWRESET,   DELAY,  //  1: Software reset, no args, w/delay
@@ -293,7 +293,7 @@ PROGMEM static prog_uchar
 
 // Companion code to the above tables.  Reads and issues
 // a series of LCD commands stored in PROGMEM byte array.
-void Adafruit_ST7735::commandList(uint8_t *addr) {
+void Adafruit_ST7735::commandList(const uint8_t *addr) {
 
   uint8_t  numCommands, numArgs;
   uint16_t ms;
@@ -318,7 +318,7 @@ void Adafruit_ST7735::commandList(uint8_t *addr) {
 
 
 // Initialization code common to both 'B' and 'R' type displays
-void Adafruit_ST7735::commonInit(uint8_t *cmdList) {
+void Adafruit_ST7735::commonInit(const uint8_t *cmdList) {
 
   colstart  = rowstart = 0; // May be overridden in init func
 
diff --git a/libraries/TFT/src/utility/Adafruit_ST7735.h b/libraries/TFT/src/utility/Adafruit_ST7735.h
index 29c1ae2ae..df52dd8a9 100644
--- a/libraries/TFT/src/utility/Adafruit_ST7735.h
+++ b/libraries/TFT/src/utility/Adafruit_ST7735.h
@@ -130,8 +130,8 @@ class Adafruit_ST7735 : public Adafruit_GFX {
   void     spiwrite(uint8_t),
            writecommand(uint8_t c),
            writedata(uint8_t d),
-           commandList(uint8_t *addr),
-           commonInit(uint8_t *cmdList);
+           commandList(const uint8_t *addr),
+           commonInit(const uint8_t *cmdList);
 //uint8_t  spiread(void);
 
   boolean  hwSPI;
diff --git a/libraries/TFT/src/utility/glcdfont.c b/libraries/TFT/src/utility/glcdfont.c
index a32505721..9527e3558 100644
--- a/libraries/TFT/src/utility/glcdfont.c
+++ b/libraries/TFT/src/utility/glcdfont.c
@@ -8,7 +8,7 @@
 
 // standard ascii 5x7 font
 
-static unsigned char  font[] PROGMEM = {
+static const unsigned char  font[] PROGMEM = {
         0x00, 0x00, 0x00, 0x00, 0x00,   
 	0x3E, 0x5B, 0x4F, 0x5B, 0x3E, 	
 	0x3E, 0x6B, 0x4F, 0x6B, 0x3E,