diff --git a/mendel/gcode.c b/mendel/gcode.c
index 01e0a58..73ebe1f 100644
--- a/mendel/gcode.c
+++ b/mendel/gcode.c
@@ -732,7 +732,7 @@ void process_gcode_command(GCODE_COMMAND *gcmd) {
 *                                                                           *
 ****************************************************************************/
 
-void request_resend() {
+void request_resend(void) {
 	serial_writestr_P(PSTR("Resend:"));
 	serwrite_uint8(next_target.N);
 	serial_writechar('\n');
diff --git a/mendel/gcode.h b/mendel/gcode.h
index 075099d..48db7ac 100644
--- a/mendel/gcode.h
+++ b/mendel/gcode.h
@@ -75,6 +75,6 @@ void scan_char(uint8_t c);
 void process_gcode_command(GCODE_COMMAND *gcmd);
 
 // uses the global variable next_target.N
-void request_resend();
+void request_resend(void);
 
 #endif	/* _GCODE_H */
diff --git a/mendel/serial.c b/mendel/serial.c
index 13703c2..63d66e3 100644
--- a/mendel/serial.c
+++ b/mendel/serial.c
@@ -184,7 +184,7 @@ void serial_writestr_P(PGM_P data)
 {
 	uint8_t r, i = 0;
 	// yes, this is *supposed* to be assignment rather than comparison, so we break when r is assigned zero
-	for (r; (r = pgm_read_byte(&data[i])); i++)
+	for ( ; (r = pgm_read_byte(&data[i])); i++)
 		serial_writechar(r);
 }