diff --git a/subsurface-core/dive.c b/subsurface-core/dive.c
index f0baf076a..9af63791a 100644
--- a/subsurface-core/dive.c
+++ b/subsurface-core/dive.c
@@ -2856,7 +2856,7 @@ struct dive *merge_dives(struct dive *a, struct dive *b, int offset, bool prefer
 	MERGE_TXT(res, a, b, divemaster);
 	MERGE_MAX(res, a, b, rating);
 	MERGE_TXT(res, a, b, suit);
-	MERGE_MAX(res, a, b, number);
+	MERGE_MIN(res, a, b, number);
 	MERGE_NONZERO(res, a, b, cns);
 	MERGE_NONZERO(res, a, b, visibility);
 	MERGE_NONZERO(res, a, b, picture_list);