diff --git a/BootROMs/agb_boot.asm b/BootROMs/agb_boot.asm
index 95a2c783a..02399f2a5 100644
--- a/BootROMs/agb_boot.asm
+++ b/BootROMs/agb_boot.asm
@@ -1,2 +1,2 @@
-AGB EQU 1
+DEF AGB = 1
 include "cgb_boot.asm"
\ No newline at end of file
diff --git a/BootROMs/cgb0_boot.asm b/BootROMs/cgb0_boot.asm
index d49166d89..5ed4c2e29 100644
--- a/BootROMs/cgb0_boot.asm
+++ b/BootROMs/cgb0_boot.asm
@@ -1,2 +1,2 @@
-CGB0 EQU 1
+DEF CGB0 = 1
 include "cgb_boot.asm"
\ No newline at end of file
diff --git a/BootROMs/cgb_boot.asm b/BootROMs/cgb_boot.asm
index 6fe6816da..fba44550e 100644
--- a/BootROMs/cgb_boot.asm
+++ b/BootROMs/cgb_boot.asm
@@ -665,8 +665,8 @@ ReadCGBLogoHalfTile:
 ; LoadTileset using PB12 codec, 2020 Jakub Kądziołka
 ; (based on PB8 codec, 2019 Damian Yerrick)
 
-SameBoyLogo_dst = $8080
-SameBoyLogo_length = (128 * 24) / 64
+DEF SameBoyLogo_dst = $8080
+DEF SameBoyLogo_length = (128 * 24) / 64
 
 LoadTileset:
     ld hl, SameBoyLogo
diff --git a/BootROMs/cgb_boot_fast.asm b/BootROMs/cgb_boot_fast.asm
index cddb47503..8707a587b 100644
--- a/BootROMs/cgb_boot_fast.asm
+++ b/BootROMs/cgb_boot_fast.asm
@@ -1,2 +1,2 @@
-FAST EQU 1
+DEF FAST = 1
 include "cgb_boot.asm"
\ No newline at end of file
diff --git a/BootROMs/mgb_boot.asm b/BootROMs/mgb_boot.asm
index 3a98aefd8..b0bc0bc9d 100644
--- a/BootROMs/mgb_boot.asm
+++ b/BootROMs/mgb_boot.asm
@@ -1,2 +1,2 @@
-MGB EQU 1
+DEF MGB = 1
 include "dmg_boot.asm"
\ No newline at end of file
diff --git a/BootROMs/sgb2_boot.asm b/BootROMs/sgb2_boot.asm
index 1c3d85847..ee14ab19f 100644
--- a/BootROMs/sgb2_boot.asm
+++ b/BootROMs/sgb2_boot.asm
@@ -1,2 +1,2 @@
-SGB2 EQU 1
+DEF SGB2 = 1
 include "sgb_boot.asm"
\ No newline at end of file