diff --git a/kernel/arch/i386/tty.nim b/kernel/arch/i386/tty.nim
index b9e1e79..bb1ab1e 100644
--- a/kernel/arch/i386/tty.nim
+++ b/kernel/arch/i386/tty.nim
@@ -1,11 +1,13 @@
 import vga
 
-type
-  VGAMemory = ptr array[0..1999, VGADoubleByte]
-
 const
   vgaWidth = 80
   vgaHeight = 25
+
+type
+  VGAMemory = ptr array[0..(vgaWidth * vgaHeight - 1), VGADoubleByte]
+
+const
   terminalBufferBaseAddress = 0xB8000
   vgaMem = cast[VGAMemory](terminalBufferBaseAddress)