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Can anyone tell me what's wrong with my GDT?

gdt: dw 0x0000, 0x0000, 0x0000, 0x0000
sys_code: dw 0FFh, 0FFh, 0h, 0h, 0h, 10011000b, 01001111b, 0h
sys_data: db 0FFh, 0FFh, 0h, 0h, 0h, 10010010b, 01001111b, 0h
gdt_end:

I'm sure the problem is the gdt because i used another one and worked correctly, but when i use the mine crashes.

I'm using Virtual PC 2007 as emulator

Thanks

matias_beretta wrote: sys_code: dw 0FFh, 0FFh, 0h, 0h, 0h, 10011000b, 01001111b, 0h

I think there should be a db instead of a dw.