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-rw-r--r--src/or/control.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/or/control.h b/src/or/control.h
index 9b0362a9a5..dbb80b1f20 100644
--- a/src/or/control.h
+++ b/src/or/control.h
@@ -166,6 +166,10 @@ void control_free_all(void);
/* If EVENT_MAX_ ever hits 0x0040, we need to make the mask into a
* different structure, as it can only handle a maximum left shift of 1<<63. */
+#if EVENT_MAX_ >= EVENT_CAPACITY_
+#error control_connection_t.event_mask has an event greater than its capacity
+#endif
+
#define EVENT_MASK_(e) (((uint64_t)1)<<(e))
#define EVENT_MASK_NONE_ ((uint64_t)0x0)