diff --git a/morse.cpp b/morse.cpp
index 9dc2931..0a9596d 100644
--- a/morse.cpp
+++ b/morse.cpp
@@ -106,7 +106,7 @@ void morseLetter(char c, uint16_t dit_duration_ms){
 }
 
 static const uint8_t RELATIVE_OFFSET_HZ = 100;
-void morseText(char *text, uint16_t dit_duration_ms){
+void morseText(const char *text, uint16_t dit_duration_ms){
   int16_t total_counts = 0;
   morseBool(false);
   enc_read();//Don't count initial tone against total_counts
diff --git a/morse.h b/morse.h
index 44ed35a..b842996 100644
--- a/morse.h
+++ b/morse.h
@@ -1,7 +1,7 @@
 #include "settings.h"
 //sends out morse code at the speed set by cwSpeed
 void morseLetter(char c, uint16_t dit_duration_ms = globalSettings.cwDitDurationMs);
-void morseText(char *text, uint16_t dit_duration_ms = globalSettings.cwDitDurationMs);
+void morseText(const char *text, uint16_t dit_duration_ms = globalSettings.cwDitDurationMs);
 
 //Plays either a higher or lower tone to indicate a boolean value
 void morseBool(bool val);