diff --git a/core/dive.h b/core/dive.h
index 8f9c95e94..7259575cc 100644
--- a/core/dive.h
+++ b/core/dive.h
@@ -303,10 +303,6 @@ extern depth_t gas_mnd(struct gasmix mix, depth_t end, const struct dive *dive,
 #define SURFACE_THRESHOLD 750 /* somewhat arbitrary: only below 75cm is it really diving */
 
 extern bool autogroup;
-/* random threashold: three days without diving -> new trip
- * this works very well for people who usually dive as part of a trip and don't
- * regularly dive at a local facility; this is why trips are an optional feature */
-#define TRIP_THRESHOLD 3600 * 24 * 3
 
 extern void add_dive_to_trip(struct dive *, dive_trip_t *);
 
diff --git a/core/divelist.c b/core/divelist.c
index b342e1cd3..aeabdb89b 100644
--- a/core/divelist.c
+++ b/core/divelist.c
@@ -955,6 +955,11 @@ dive_trip_t *create_and_hookup_trip_from_dive(struct dive *dive, struct trip_tab
 	return dive_trip;
 }
 
+/* random threshold: three days without diving -> new trip
+ * this works very well for people who usually dive as part of a trip and don't
+ * regularly dive at a local facility; this is why trips are an optional feature */
+#define TRIP_THRESHOLD 3600 * 24 * 3
+
 /*
  * Find a trip a new dive should be autogrouped with. If no such trips
  * exist, allocate a new trip. The bool "*allocated" is set to true