diff --git a/HamShield.cpp b/HamShield.cpp
index 224ce68..6044f14 100644
--- a/HamShield.cpp
+++ b/HamShield.cpp
@@ -1299,7 +1299,7 @@ void HamShield::morseOut(char buffer[HAMSHIELD_MORSE_BUFFER_SIZE]) {
 
 /* Morse code lookup table */
 
-char HamShield::morseLookup(char letter) { 
+uint8_t HamShield::morseLookup(char letter) { 
   uint8_t i;
   for(i = 0; i < MORSE_TABLE_LENGTH; i++) {
 #ifndef MORSE_TABLE_PROGMEM
diff --git a/HamShield.h b/HamShield.h
index 45949a1..3afac90 100644
--- a/HamShield.h
+++ b/HamShield.h
@@ -522,7 +522,7 @@ class HamShield {
         static void isr_ptt();
         static void isr_reset();
 	void morseOut(char buffer[HAMSHIELD_MORSE_BUFFER_SIZE]);
-	char morseLookup(char letter);
+	uint8_t morseLookup(char letter);
         bool waitForChannel(long timeout, long breakwindow, int setRSSI);
         void SSTVVISCode(int code);
         void SSTVTestPattern(int code);