1 files changed, 2 insertions, 0 deletions
diff --git a/dive.h b/dive.h
index 0549843ab..bdf3aa6e1 100644
--- a/dive.h
+++ b/dive.h
@@ -326,4 +326,6 @@ const char *monthname(int mon);
 #define FIVE_STARS	UTF8_BLACKSTAR UTF8_BLACKSTAR UTF8_BLACKSTAR UTF8_BLACKSTAR UTF8_BLACKSTAR
 extern const char *star_strings[];
 
+#define AIR_PERMILLE 209
+
 #endif /* DIVE_H */