diff --git a/keyboards/boston_meetup/2019/rules.mk b/keyboards/boston_meetup/2019/rules.mk
index c79ce4b441a..5aaac4b3ed4 100644
--- a/keyboards/boston_meetup/2019/rules.mk
+++ b/keyboards/boston_meetup/2019/rules.mk
@@ -21,4 +21,3 @@ RGB_MATRIX_DRIVER = WS2812
 HAPTIC_ENABLE += DRV2605L
 QWIIC_ENABLE = yes
 QWIIC_DRIVERS += MICRO_OLED
-# SERIAL_LINK_ENABLE = yes
diff --git a/keyboards/ckeys/thedora/rules.mk b/keyboards/ckeys/thedora/rules.mk
index 508af7d3944..e364db1c1b0 100755
--- a/keyboards/ckeys/thedora/rules.mk
+++ b/keyboards/ckeys/thedora/rules.mk
@@ -17,4 +17,3 @@ AUDIO_ENABLE = yes
 MIDI_ENABLE = yes     # MIDI controls
 RGBLIGHT_ENABLE = no
 ENCODER_ENABLE = yes
-# SERIAL_LINK_ENABLE = yes
diff --git a/keyboards/hadron/ver3/rules.mk b/keyboards/hadron/ver3/rules.mk
index 62d7fb09e50..c7ed67682a2 100644
--- a/keyboards/hadron/ver3/rules.mk
+++ b/keyboards/hadron/ver3/rules.mk
@@ -22,4 +22,3 @@ HAPTIC_ENABLE += DRV2605L
 QWIIC_ENABLE = yes
 QWIIC_DRIVERS += MICRO_OLED
 ENCODER_ENABLER = yes
-# SERIAL_LINK_ENABLE = yes
diff --git a/keyboards/hs60/v2/ansi/rules.mk b/keyboards/hs60/v2/ansi/rules.mk
index 74889decfb8..5d51892634d 100644
--- a/keyboards/hs60/v2/ansi/rules.mk
+++ b/keyboards/hs60/v2/ansi/rules.mk
@@ -20,7 +20,6 @@ SLEEP_LED_ENABLE = no              # Breathing sleep LED during USB suspend
 NKRO_ENABLE = yes                  # USB Nkey Rollover
 AUDIO_ENABLE = no                  # Audio output on port C6
 NO_USB_STARTUP_CHECK = no          # Disable initialization only when usb is plugged in
-#SERIAL_LINK_ENABLE = yes
 
 CIE1931_CURVE = yes
 
diff --git a/keyboards/hs60/v2/hhkb/rules.mk b/keyboards/hs60/v2/hhkb/rules.mk
index 561a8cd06ab..780454d3f3c 100644
--- a/keyboards/hs60/v2/hhkb/rules.mk
+++ b/keyboards/hs60/v2/hhkb/rules.mk
@@ -20,7 +20,6 @@ SLEEP_LED_ENABLE = no              # Breathing sleep LED during USB suspend
 NKRO_ENABLE = yes                  # USB Nkey Rollover
 AUDIO_ENABLE = no                  # Audio output on port C6
 NO_USB_STARTUP_CHECK = no          # Disable initialization only when usb is plugged in
-#SERIAL_LINK_ENABLE = yes
 
 CIE1931_CURVE = yes
 
diff --git a/keyboards/hs60/v2/iso/rules.mk b/keyboards/hs60/v2/iso/rules.mk
index 62af70cc059..a27f8a06481 100644
--- a/keyboards/hs60/v2/iso/rules.mk
+++ b/keyboards/hs60/v2/iso/rules.mk
@@ -20,7 +20,6 @@ SLEEP_LED_ENABLE = no              # Breathing sleep LED during USB suspend
 NKRO_ENABLE = yes                  # USB Nkey Rollover
 AUDIO_ENABLE = no                  # Audio output on port C6
 NO_USB_STARTUP_CHECK = no          # Disable initialization only when usb is plugged in
-#SERIAL_LINK_ENABLE = yes
 
 CIE1931_CURVE = yes
 
diff --git a/keyboards/moonlander/rules.mk b/keyboards/moonlander/rules.mk
index 561db849e74..7076347ec8b 100644
--- a/keyboards/moonlander/rules.mk
+++ b/keyboards/moonlander/rules.mk
@@ -23,7 +23,6 @@ DEBOUNCE_TYPE = custom
 SWAP_HANDS_ENABLE = yes
 RGB_MATRIX_ENABLE = yes
 RGB_MATRIX_DRIVER = IS31FL3731
-#SERIAL_LINK_ENABLE = yes
 EEPROM_DRIVER = i2c
 
 #project specific files
diff --git a/keyboards/nk65/rules.mk b/keyboards/nk65/rules.mk
index af41e71cbc9..2e270289d37 100755
--- a/keyboards/nk65/rules.mk
+++ b/keyboards/nk65/rules.mk
@@ -20,7 +20,6 @@ SLEEP_LED_ENABLE = no              # Breathing sleep LED during USB suspend
 NKRO_ENABLE = yes                  # USB Nkey Rollover
 AUDIO_ENABLE = no                  # Audio output on port C6
 NO_USB_STARTUP_CHECK = no          # Disable initialization only when usb is plugged in
-#SERIAL_LINK_ENABLE = yes
 
 CIE1931_CURVE = yes
 
diff --git a/keyboards/planck/ez/rules.mk b/keyboards/planck/ez/rules.mk
index acf3455c94a..85d474c5e70 100644
--- a/keyboards/planck/ez/rules.mk
+++ b/keyboards/planck/ez/rules.mk
@@ -24,7 +24,6 @@ API_SYSEX_ENABLE = no
 SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
 #SLEEP_LED_ENABLE = yes  # Breathing sleep LED during USB suspend
 
-# SERIAL_LINK_ENABLE = yes
 ENCODER_ENABLE = yes
 RGB_MATRIX_DRIVER = IS31FL3737
 
diff --git a/keyboards/planck/keymaps/ishtob/rule.mk b/keyboards/planck/keymaps/ishtob/rule.mk
index a6ffdf639c1..c8ba0c919e4 100755
--- a/keyboards/planck/keymaps/ishtob/rule.mk
+++ b/keyboards/planck/keymaps/ishtob/rule.mk
@@ -12,7 +12,6 @@ NKRO_ENABLE = yes	    # USB Nkey Rollover
 CUSTOM_MATRIX = yes # Custom matrix file
 AUDIO_ENABLE = yes
 ENCODER_ENABLE = yes
-# SERIAL_LINK_ENABLE = yes
 
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
 SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
diff --git a/keyboards/planck/rev6/rules.mk b/keyboards/planck/rev6/rules.mk
index e0f9ff0d0e0..87da1696a00 100644
--- a/keyboards/planck/rev6/rules.mk
+++ b/keyboards/planck/rev6/rules.mk
@@ -26,7 +26,6 @@ SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
 
 RGB_MATRIX_ENABLE = no
 RGB_MATRIX_DRIVER = WS2812
-# SERIAL_LINK_ENABLE = yes
 ENCODER_ENABLE = yes
 DIP_SWITCH_ENABLE = yes
 
diff --git a/keyboards/preonic/rev3/rules.mk b/keyboards/preonic/rev3/rules.mk
index d600be4a4cc..ca3e8f0ada4 100644
--- a/keyboards/preonic/rev3/rules.mk
+++ b/keyboards/preonic/rev3/rules.mk
@@ -29,7 +29,6 @@ SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
 RGB_MATRIX_ENABLE = no
 RGB_MATRIX_DRIVER = WS2812
 
-# SERIAL_LINK_ENABLE = yes
 ENCODER_ENABLE = yes
 DIP_SWITCH_ENABLE = yes
 
diff --git a/keyboards/tkc/candybar/lefty/rules.mk b/keyboards/tkc/candybar/lefty/rules.mk
index c761d2b30b1..762df4a5306 100644
--- a/keyboards/tkc/candybar/lefty/rules.mk
+++ b/keyboards/tkc/candybar/lefty/rules.mk
@@ -16,7 +16,6 @@ SLEEP_LED_ENABLE = no  # Breathing sleep LED during USB suspend
 NKRO_ENABLE = yes     # USB Nkey Rollover
 AUDIO_ENABLE = no
 RGBLIGHT_ENABLE = no
-SERIAL_LINK_ENABLE = no
 
 
 # Enter lower-power sleep mode when on the ChibiOS idle thread
diff --git a/keyboards/tkc/candybar/righty/rules.mk b/keyboards/tkc/candybar/righty/rules.mk
index c761d2b30b1..762df4a5306 100644
--- a/keyboards/tkc/candybar/righty/rules.mk
+++ b/keyboards/tkc/candybar/righty/rules.mk
@@ -16,7 +16,6 @@ SLEEP_LED_ENABLE = no  # Breathing sleep LED during USB suspend
 NKRO_ENABLE = yes     # USB Nkey Rollover
 AUDIO_ENABLE = no
 RGBLIGHT_ENABLE = no
-SERIAL_LINK_ENABLE = no
 
 
 # Enter lower-power sleep mode when on the ChibiOS idle thread
diff --git a/layouts/community/ortho_4x12/bocaj/rules.mk b/layouts/community/ortho_4x12/bocaj/rules.mk
index 3383cfd35f3..5c642e65ca3 100644
--- a/layouts/community/ortho_4x12/bocaj/rules.mk
+++ b/layouts/community/ortho_4x12/bocaj/rules.mk
@@ -32,7 +32,6 @@ ifeq ($(strip $(KEYBOARD)), planck/light)
 endif
 ifeq ($(strip $(KEYBOARD)), planck/ez)
     RGBLIGHT_ENABLE = no
-    # SERIAL_LINK_ENABLE = yes
     ENCODER_ENABLE = yes
     RGB_MATRIX_ENABLE = IS31FL3737
     INDICATOR_LIGHTS            = yes
diff --git a/layouts/community/ortho_4x12/drashna/rules.mk b/layouts/community/ortho_4x12/drashna/rules.mk
index 2a9576758f3..06a250ee79c 100644
--- a/layouts/community/ortho_4x12/drashna/rules.mk
+++ b/layouts/community/ortho_4x12/drashna/rules.mk
@@ -32,7 +32,6 @@ ifeq ($(strip $(KEYBOARD)), planck/light)
 endif
 ifeq ($(strip $(KEYBOARD)), planck/ez)
     RGBLIGHT_ENABLE = no
-    # SERIAL_LINK_ENABLE = yes
     ENCODER_ENABLE = yes
     RGB_MATRIX_ENABLE = yes
     INDICATOR_LIGHTS            = yes