diff --git a/src/LiquidCrystal.cpp b/src/LiquidCrystal.cpp
index 67bd06d..6a1c98b 100644
--- a/src/LiquidCrystal.cpp
+++ b/src/LiquidCrystal.cpp
@@ -262,7 +262,7 @@ void LiquidCrystal::noAutoscroll(void) {
 
 // Allows us to fill the first 8 CGRAM locations
 // with custom characters
-void LiquidCrystal::createChar(uint8_t location, uint8_t charmap[]) {
+void LiquidCrystal::createChar(uint8_t location, const uint8_t charmap[]) {
   location &= 0x7; // we only have 8 locations 0-7
   command(LCD_SETCGRAMADDR | (location << 3));
   for (int i=0; i<8; i++) {
diff --git a/src/LiquidCrystal.h b/src/LiquidCrystal.h
index f063086..aa28662 100644
--- a/src/LiquidCrystal.h
+++ b/src/LiquidCrystal.h
@@ -78,7 +78,7 @@ class LiquidCrystal : public Print {
   void noAutoscroll();
 
   void setRowOffsets(int row1, int row2, int row3, int row4);
-  void createChar(uint8_t, uint8_t[]);
+  void createChar(uint8_t, const uint8_t[]);
   void setCursor(uint8_t, uint8_t); 
   virtual size_t write(uint8_t);
   void command(uint8_t);