diff --git a/Extensions/Button.cpp b/Extensions/Button.cpp
index 88a8bc0..6ec3373 100644
--- a/Extensions/Button.cpp
+++ b/Extensions/Button.cpp
@@ -10,7 +10,7 @@ TFT_eSPI_Button::TFT_eSPI_Button(void) {
 void TFT_eSPI_Button::initButton(
  TFT_eSPI *gfx, int16_t x, int16_t y, uint16_t w, uint16_t h,
  uint16_t outline, uint16_t fill, uint16_t textcolor,
- char *label, uint8_t textsize)
+ const char *label, uint8_t textsize)
 {
   // Tweak arguments and pass to the newer initButtonUL() function...
   initButtonUL(gfx, x - (w / 2), y - (h / 2), w, h, outline, fill,
@@ -21,7 +21,7 @@ void TFT_eSPI_Button::initButton(
 void TFT_eSPI_Button::initButtonUL(
  TFT_eSPI *gfx, int16_t x1, int16_t y1, uint16_t w, uint16_t h,
  uint16_t outline, uint16_t fill, uint16_t textcolor,
- char *label, uint8_t textsize)
+ const char *label, uint8_t textsize)
 {
   _x1           = x1;
   _y1           = y1;
diff --git a/Extensions/Button.h b/Extensions/Button.h
index e44a8f4..eca4362 100644
--- a/Extensions/Button.h
+++ b/Extensions/Button.h
@@ -12,12 +12,12 @@ class TFT_eSPI_Button {
   // "Classic" initButton() uses center & size
   void     initButton(TFT_eSPI *gfx, int16_t x, int16_t y,
   uint16_t w, uint16_t h, uint16_t outline, uint16_t fill,
-  uint16_t textcolor, char *label, uint8_t textsize);
+  uint16_t textcolor, const char *label, uint8_t textsize);
 
   // New/alt initButton() uses upper-left corner & size
   void     initButtonUL(TFT_eSPI *gfx, int16_t x1, int16_t y1,
   uint16_t w, uint16_t h, uint16_t outline, uint16_t fill,
-  uint16_t textcolor, char *label, uint8_t textsize);
+  uint16_t textcolor, const char *label, uint8_t textsize);
   void     drawButton(boolean inverted = false);
   boolean  contains(int16_t x, int16_t y);