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-rw-r--r--protocol.mk2
1 files changed, 2 insertions, 0 deletions
diff --git a/protocol.mk b/protocol.mk
index e057d1d601..d9194b2bfc 100644
--- a/protocol.mk
+++ b/protocol.mk
@@ -15,11 +15,13 @@ endif
 
 ifdef PS2_USE_INT
     SRC += protocol/ps2_interrupt.c
+    SRC += protocol/ps2_io_avr.c
     OPT_DEFS += -DPS2_USE_INT
 endif
 
 ifdef PS2_USE_USART
     SRC += protocol/ps2_usart.c
+    SRC += protocol/ps2_io_avr.c
     OPT_DEFS += -DPS2_USE_USART
 endif