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-rw-r--r--src/core/ao.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/core/ao.h b/src/core/ao.h
index 86a943a8..b2f3305f 100644
--- a/src/core/ao.h
+++ b/src/core/ao.h
@@ -899,7 +899,7 @@ ao_dbg_init(void);
#error Please define HAS_SERIAL_1
#endif
-#if HAS_SERIAL_1
+#if HAS_SERIAL_1 | HAS_SERIAL_2 | HAS_SERIAL_3
#ifndef USE_SERIAL_STDIN
#error Please define USE_SERIAL_STDIN
#endif