diff --git a/ini/stm32g0.ini b/ini/stm32g0.ini
index 8da5ab230f..77bdde7438 100644
--- a/ini/stm32g0.ini
+++ b/ini/stm32g0.ini
@@ -57,6 +57,7 @@ board_build.offset          = 0x2000
 board_upload.offset_address = 0x08002000
 build_flags                 = ${stm32_variant.build_flags}
                               -DPIN_SERIAL4_RX=PC_11 -DPIN_SERIAL4_TX=PC_10
+                              -DPIN_SERIAL5_RX=PD_2 -DPIN_SERIAL5_TX=PD_3
                               -DSERIAL_RX_BUFFER_SIZE=1024 -DSERIAL_TX_BUFFER_SIZE=1024
                               -DTIMER_SERVO=TIM3 -DTIMER_TONE=TIM4
                               -DSTEP_TIMER_IRQ_PRIO=0