diff --git a/src/Arduboy2.cpp b/src/Arduboy2.cpp
index df39798..df18e2c 100644
--- a/src/Arduboy2.cpp
+++ b/src/Arduboy2.cpp
@@ -1099,7 +1099,7 @@ uint8_t Arduboy2Base::readUnitName(char* name)
   return dest;
 }
 
-void Arduboy2Base::writeUnitName(char* name)
+void Arduboy2Base::writeUnitName(const char* name)
 {
   bool done = false;
   uint8_t dest = eepromUnitName;
diff --git a/src/Arduboy2.h b/src/Arduboy2.h
index d348cf6..775d0bb 100644
--- a/src/Arduboy2.h
+++ b/src/Arduboy2.h
@@ -1207,7 +1207,7 @@ class Arduboy2Base : public Arduboy2Core
    * \see readUnitName() writeUnitID() Arduboy2::bootLogoExtra()
    * ARDUBOY_UNIT_NAME_BUFFER_SIZE ARDUBOY_UNIT_NAME_LEN Arduboy2::font5x7
    */
-  void writeUnitName(char* name);
+  void writeUnitName(const char* name);
 
   /** \brief
    * Read the "Show Boot Logo" flag in system EEPROM.