diff --git a/Marlin/Marlin.h b/Marlin/Marlin.h
index bc1f567fe..3c0ab801b 100644
--- a/Marlin/Marlin.h
+++ b/Marlin/Marlin.h
@@ -105,6 +105,7 @@ extern const char echomagic[] PROGMEM;
 
 #define SERIAL_ECHOPAIR(name,value) (serial_echopair_P(PSTR(name),(value)))
 
+void serial_echopair_P(const char* s_P, char v);
 void serial_echopair_P(const char* s_P, int v);
 void serial_echopair_P(const char* s_P, long v);
 void serial_echopair_P(const char* s_P, float v);
diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index e7355292f..df947a62b 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -572,6 +572,7 @@ void prepare_move_to_destination();
   void plan_cubic_move(const float offset[4]);
 #endif
 
+void serial_echopair_P(const char* s_P, char v)          { serialprintPGM(s_P); SERIAL_CHAR(v); }
 void serial_echopair_P(const char* s_P, int v)           { serialprintPGM(s_P); SERIAL_ECHO(v); }
 void serial_echopair_P(const char* s_P, long v)          { serialprintPGM(s_P); SERIAL_ECHO(v); }
 void serial_echopair_P(const char* s_P, float v)         { serialprintPGM(s_P); SERIAL_ECHO(v); }