diff --git a/constants/serial_constants.asm b/constants/serial_constants.asm
index 97b176c58..791fad245 100644
--- a/constants/serial_constants.asm
+++ b/constants/serial_constants.asm
@@ -14,9 +14,6 @@ DEF SERIAL_BATTLE      EQU $80
 DEF ESTABLISH_CONNECTION_WITH_INTERNAL_CLOCK EQU $01
 DEF ESTABLISH_CONNECTION_WITH_EXTERNAL_CLOCK EQU $02
 
-DEF START_TRANSFER_EXTERNAL_CLOCK EQU $80 ; 1 << rSC_ON
-DEF START_TRANSFER_INTERNAL_CLOCK EQU $81 ; (1 << rSC_ON) | 1
-
 ; hSerialConnectionStatus
 DEF USING_EXTERNAL_CLOCK       EQU $01
 DEF USING_INTERNAL_CLOCK       EQU $02