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-rw-r--r--protocol.mk1
1 files changed, 1 insertions, 0 deletions
diff --git a/protocol.mk b/protocol.mk
index de7014e866..e057d1d601 100644
--- a/protocol.mk
+++ b/protocol.mk
@@ -9,6 +9,7 @@ endif
ifdef PS2_USE_BUSYWAIT
SRC += protocol/ps2_busywait.c
+ SRC += protocol/ps2_io_avr.c
OPT_DEFS += -DPS2_USE_BUSYWAIT
endif