diff --git a/keyboards/at_at/660m/rules.mk b/keyboards/at_at/660m/rules.mk
index 3d6d4b9ee48a..595d1951f6df 100644
--- a/keyboards/at_at/660m/rules.mk
+++ b/keyboards/at_at/660m/rules.mk
@@ -15,7 +15,6 @@ EXTRAKEY_ENABLE = yes	# Audio control and System control
 CONSOLE_ENABLE = yes	# Console for debug
 COMMAND_ENABLE = yes    # Commands for debug and configuration
 NKRO_ENABLE = yes	    # USB Nkey Rollover
-CUSTOM_MATRIX = no # Custom matrix file
 # BACKLIGHT_ENABLE = yes
 # RGBLIGHT_ENABLE = yes
 NO_USB_STARTUP_CHECK = yes # Workaround for issue 6369
diff --git a/keyboards/cannonkeys/an_c/rules.mk b/keyboards/cannonkeys/an_c/rules.mk
index 823408fe919a..44d260b4d8a5 100644
--- a/keyboards/cannonkeys/an_c/rules.mk
+++ b/keyboards/cannonkeys/an_c/rules.mk
@@ -18,7 +18,6 @@ EXTRAKEY_ENABLE = yes	# Audio control and System control
 CONSOLE_ENABLE = yes	# Console for debug
 COMMAND_ENABLE = yes    # Commands for debug and configuration
 NKRO_ENABLE = yes	    # USB Nkey Rollover
-CUSTOM_MATRIX = no # Custom matrix file
 BACKLIGHT_ENABLE = yes
 RGBLIGHT_ENABLE = yes
 WS2812_DRIVER = spi
diff --git a/keyboards/cannonkeys/atlas/rules.mk b/keyboards/cannonkeys/atlas/rules.mk
index a91a19ad2c9a..e84f4250b504 100644
--- a/keyboards/cannonkeys/atlas/rules.mk
+++ b/keyboards/cannonkeys/atlas/rules.mk
@@ -12,7 +12,6 @@ EXTRAKEY_ENABLE = yes       # Audio control and System control
 CONSOLE_ENABLE = yes        # Console for debug
 COMMAND_ENABLE = yes        # Commands for debug and configuration
 NKRO_ENABLE = yes           # USB Nkey Rollover
-CUSTOM_MATRIX = no          # Custom matrix file
 BACKLIGHT_ENABLE = no
 RGBLIGHT_ENABLE = yes
 WS2812_DRIVER = spi
diff --git a/keyboards/cannonkeys/chimera65/rules.mk b/keyboards/cannonkeys/chimera65/rules.mk
index 88954bfebdf5..007289fc7902 100644
--- a/keyboards/cannonkeys/chimera65/rules.mk
+++ b/keyboards/cannonkeys/chimera65/rules.mk
@@ -15,7 +15,6 @@ EXTRAKEY_ENABLE = yes	# Audio control and System control
 CONSOLE_ENABLE = yes	# Console for debug
 COMMAND_ENABLE = yes    # Commands for debug and configuration
 NKRO_ENABLE = yes	    # USB Nkey Rollover
-CUSTOM_MATRIX = no # Custom matrix file
 BACKLIGHT_ENABLE = yes
 RGBLIGHT_ENABLE = no
 
diff --git a/keyboards/cannonkeys/devastatingtkl/rules.mk b/keyboards/cannonkeys/devastatingtkl/rules.mk
index 5136066aa246..1b47de53c6ad 100644
--- a/keyboards/cannonkeys/devastatingtkl/rules.mk
+++ b/keyboards/cannonkeys/devastatingtkl/rules.mk
@@ -16,7 +16,6 @@ EXTRAKEY_ENABLE = yes	# Audio control and System control
 CONSOLE_ENABLE = yes	# Console for debug
 COMMAND_ENABLE = yes    # Commands for debug and configuration
 NKRO_ENABLE = yes	    # USB Nkey Rollover
-CUSTOM_MATRIX = no # Custom matrix file
 BACKLIGHT_ENABLE = yes
 RGBLIGHT_ENABLE = yes
 WS2812_DRIVER = spi
diff --git a/keyboards/cannonkeys/instant60/rules.mk b/keyboards/cannonkeys/instant60/rules.mk
index 17a61f729566..7b12059d3a9b 100644
--- a/keyboards/cannonkeys/instant60/rules.mk
+++ b/keyboards/cannonkeys/instant60/rules.mk
@@ -17,7 +17,6 @@ EXTRAKEY_ENABLE = yes	# Audio control and System control
 CONSOLE_ENABLE = yes	# Console for debug
 COMMAND_ENABLE = yes    # Commands for debug and configuration
 NKRO_ENABLE = yes	    # USB Nkey Rollover
-CUSTOM_MATRIX = no # Custom matrix file
 BACKLIGHT_ENABLE = yes
 RGBLIGHT_ENABLE = yes
 WS2812_DRIVER = spi
diff --git a/keyboards/cannonkeys/iron165/rules.mk b/keyboards/cannonkeys/iron165/rules.mk
index 0f862169f988..275abdb42647 100644
--- a/keyboards/cannonkeys/iron165/rules.mk
+++ b/keyboards/cannonkeys/iron165/rules.mk
@@ -13,7 +13,6 @@ EXTRAKEY_ENABLE = yes	# Audio control and System control
 CONSOLE_ENABLE = yes	# Console for debug
 COMMAND_ENABLE = yes    # Commands for debug and configuration
 NKRO_ENABLE = yes	    # USB Nkey Rollover
-CUSTOM_MATRIX = no # Custom matrix file
 BACKLIGHT_ENABLE = yes
 RGBLIGHT_ENABLE = no
 
diff --git a/keyboards/cannonkeys/rekt1800/rules.mk b/keyboards/cannonkeys/rekt1800/rules.mk
index 20a5caec26cd..14284a6081f5 100644
--- a/keyboards/cannonkeys/rekt1800/rules.mk
+++ b/keyboards/cannonkeys/rekt1800/rules.mk
@@ -16,7 +16,6 @@ EXTRAKEY_ENABLE = yes       # Audio control and System control
 CONSOLE_ENABLE = yes        # Console for debug
 COMMAND_ENABLE = yes        # Commands for debug and configuration
 NKRO_ENABLE = yes           # USB Nkey Rollover
-CUSTOM_MATRIX = no          # Custom matrix file
 BACKLIGHT_ENABLE = yes
 RGBLIGHT_ENABLE = no
 
diff --git a/keyboards/cannonkeys/savage65/rules.mk b/keyboards/cannonkeys/savage65/rules.mk
index ac28d884899a..14bd161e98ff 100644
--- a/keyboards/cannonkeys/savage65/rules.mk
+++ b/keyboards/cannonkeys/savage65/rules.mk
@@ -18,7 +18,6 @@ EXTRAKEY_ENABLE = yes	# Audio control and System control
 CONSOLE_ENABLE = yes	# Console for debug
 COMMAND_ENABLE = yes    # Commands for debug and configuration
 NKRO_ENABLE = yes	    # USB Nkey Rollover
-CUSTOM_MATRIX = no # Custom matrix file
 BACKLIGHT_ENABLE = yes
 RGBLIGHT_ENABLE = yes
 WS2812_DRIVER = spi
diff --git a/keyboards/cannonkeys/tmov2/rules.mk b/keyboards/cannonkeys/tmov2/rules.mk
index c21c303d73ef..9a89d4e80479 100644
--- a/keyboards/cannonkeys/tmov2/rules.mk
+++ b/keyboards/cannonkeys/tmov2/rules.mk
@@ -18,7 +18,6 @@ EXTRAKEY_ENABLE = yes	# Audio control and System control
 CONSOLE_ENABLE = yes	# Console for debug
 COMMAND_ENABLE = yes    # Commands for debug and configuration
 NKRO_ENABLE = yes	    # USB Nkey Rollover
-CUSTOM_MATRIX = no # Custom matrix file
 BACKLIGHT_ENABLE = yes
 RGBLIGHT_ENABLE = yes
 WS2812_DRIVER = spi
diff --git a/keyboards/hadron/ver3/rules.mk b/keyboards/hadron/ver3/rules.mk
index cb9a16e5f17d..69d33cb0aeb7 100644
--- a/keyboards/hadron/ver3/rules.mk
+++ b/keyboards/hadron/ver3/rules.mk
@@ -15,7 +15,6 @@ EXTRAKEY_ENABLE = yes	# Audio control and System control
 CONSOLE_ENABLE = no	# Console for debug
 COMMAND_ENABLE = yes    # Commands for debug and configuration
 NKRO_ENABLE = yes	    # USB Nkey Rollover
-CUSTOM_MATRIX = no # Custom matrix file
 AUDIO_ENABLE = yes
 RGBLIGHT_ENABLE = yes
 RGB_MATRIX_ENABLE = no # once arm_rgb is implemented
diff --git a/keyboards/handwired/ck4x4/rules.mk b/keyboards/handwired/ck4x4/rules.mk
index 211921da4237..da2f4ec36249 100644
--- a/keyboards/handwired/ck4x4/rules.mk
+++ b/keyboards/handwired/ck4x4/rules.mk
@@ -14,7 +14,6 @@ EXTRAKEY_ENABLE = yes	# Audio control and System control
 CONSOLE_ENABLE = yes	# Console for debug
 COMMAND_ENABLE = yes    # Commands for debug and configuration
 NKRO_ENABLE = yes	    # USB Nkey Rollover
-CUSTOM_MATRIX = no # Custom matrix file
 
 DEFAULT_FOLDER = handwired/ck4x4
 
diff --git a/keyboards/miniaxe/rules.mk b/keyboards/miniaxe/rules.mk
index fc57244e253d..e23cafaa72a2 100644
--- a/keyboards/miniaxe/rules.mk
+++ b/keyboards/miniaxe/rules.mk
@@ -19,7 +19,6 @@ RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
 AUDIO_ENABLE = no           # Audio output
 
 DEBUG_ENABLE = no
-CUSTOM_MATRIX = no         # Use custom matrix code
 SPLIT_KEYBOARD = yes        # Use shared split_common code
 
 LAYOUTS = split_3x5_3
diff --git a/keyboards/westfoxtrot/prophet/rules.mk b/keyboards/westfoxtrot/prophet/rules.mk
index 9598bdfb20be..719f5bfafd96 100644
--- a/keyboards/westfoxtrot/prophet/rules.mk
+++ b/keyboards/westfoxtrot/prophet/rules.mk
@@ -14,7 +14,6 @@ CONSOLE_ENABLE = no	# Console for debug
 COMMAND_ENABLE = no    # Commands for debug and configuration
 NKRO_ENABLE = yes	    # USB Nkey Rollover
 SLEEP_LED_ENABLE = yes
-CUSTOM_MATRIX = no # Custom matrix file
 BACKLIGHT_ENABLE = no
 RGBLIGHT_ENABLE = no
 
diff --git a/keyboards/xiaomi/mk02/rules.mk b/keyboards/xiaomi/mk02/rules.mk
index 9eefd29a2c5b..0383dd7e2e32 100644
--- a/keyboards/xiaomi/mk02/rules.mk
+++ b/keyboards/xiaomi/mk02/rules.mk
@@ -12,6 +12,5 @@ EXTRAKEY_ENABLE = no	# Audio control and System control
 CONSOLE_ENABLE = no	# Console for debug
 COMMAND_ENABLE = no    # Commands for debug and configuration
 NKRO_ENABLE = no	    # USB Nkey Rollover
-CUSTOM_MATRIX = no # Custom matrix file
 # BACKLIGHT_ENABLE = yes # This is broken on 072 for some reason
 RGBLIGHT_ENABLE = no