diff --git a/src/taglist.c b/src/taglist.c
index 99d23bf5f..1849c314c 100644
--- a/src/taglist.c
+++ b/src/taglist.c
@@ -111,6 +111,12 @@ static void Taglist_AddToMapthings (const mtag_t tag, const size_t itemid)
 	tagelems->elements[tagelems->count - 1] = itemid;
 }
 
+void Tag_SectorFSet (const size_t id, const mtag_t tag)
+{
+	sector_t* sec = &sectors[id];
+	Tag_FSet(&sec->tags, tag);
+}
+
 void Taglist_InitGlobalTables(void)
 {
 	size_t i, j;
diff --git a/src/taglist.h b/src/taglist.h
index b14c316ff..050bebed7 100644
--- a/src/taglist.h
+++ b/src/taglist.h
@@ -23,6 +23,8 @@ boolean Tag_Share (const taglist_t* list1, const taglist_t* list2);
 
 boolean Tag_Compare (const taglist_t* list1, const taglist_t* list2);
 
+void Tag_SectorFSet (const size_t id, const mtag_t tag);
+
 typedef struct
 {
 	size_t *elements;