1 files changed, 7 insertions, 0 deletions
diff --git a/crawl-ref/source/enum.h b/crawl-ref/source/enum.h
index c970478866..d14fd76c9a 100644
--- a/crawl-ref/source/enum.h
+++ b/crawl-ref/source/enum.h
@@ -3167,6 +3167,13 @@ enum montravel_target_type
     MTRAV_KNOWN_UNREACHABLE // As above, and the player knows this.
 };
 
+enum maybe_bool
+{
+    B_FALSE,
+    B_MAYBE,
+    B_TRUE
+};
+
 #ifdef USE_TILE
 enum screen_mode
 {