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-rw-r--r--src/ao_monitor.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/ao_monitor.c b/src/ao_monitor.c
index 8f1b9e12..69eb58e8 100644
--- a/src/ao_monitor.c
+++ b/src/ao_monitor.c
@@ -18,6 +18,10 @@
#include "ao.h"
#include "ao_telem.h"
+#if !HAS_MONITOR
+#error Must define HAS_MONITOR to 1
+#endif
+
__xdata uint8_t ao_monitoring;
__pdata uint8_t ao_monitor_led;