diff --git a/avr/devices/s03/defs.asm b/avr/devices/s03/defs.asm
index 5a31457..06d6a17 100644
--- a/avr/devices/s03/defs.asm
+++ b/avr/devices/s03/defs.asm
@@ -102,46 +102,36 @@
 
 .equ COM_MASK_CLK0     = (1<<PINA0)
 .equ COM_MASK_DATA0    = (1<<PINC0)
-.equ COM_MASK_IRQ0     = (1<<PCINT0)
 
 .equ COM_MASK_CLK1     = (1<<PINA1)
 .equ COM_MASK_DATA1    = (1<<PINC1)
-.equ COM_MASK_IRQ1     = (1<<PCINT1)
 
 .equ COM_MASK_CLK2     = (1<<PINA2)
 .equ COM_MASK_DATA2    = (1<<PINC2)
-.equ COM_MASK_IRQ2     = (1<<PCINT2)
 
 .equ COM_MASK_CLK3     = (1<<PINA3)
 .equ COM_MASK_DATA3    = (1<<PINC3)
-.equ COM_MASK_IRQ3     = (1<<PCINT3)
 
 .equ COM_MASK_CLK4     = (1<<PINA4)
 .equ COM_MASK_DATA4    = (1<<PINC4)
-.equ COM_MASK_IRQ4     = (1<<PCINT4)
 
 .equ COM_MASK_CLK5     = (1<<PINA5)
 .equ COM_MASK_DATA5    = (1<<PINC5)
-.equ COM_MASK_IRQ5     = (1<<PCINT5)
 
 .equ COM_MASK_CLK6     = (1<<PINA6)
 .equ COM_MASK_DATA6    = (1<<PINC6)
-.equ COM_MASK_IRQ6     = (1<<PCINT6)
 
 .equ COM_MASK_CLK7     = (1<<PINA7)
 .equ COM_MASK_DATA7    = (1<<PINC7)
-.equ COM_MASK_IRQ7     = (1<<PCINT7)
 
 #else
 .equ COM_PORTS         = 2
 
 .equ COM_MASK_CLK0     = (1<<PINA6)
 .equ COM_MASK_DATA0    = (1<<PINC6)
-.equ COM_MASK_IRQ0     = (1<<PCINT6)
 
 .equ COM_MASK_CLK1     = (1<<PINA5)
 .equ COM_MASK_DATA1    = (1<<PINC5)
-.equ COM_MASK_IRQ1     = (1<<PCINT5)
 
 #endif