1 files changed, 2 insertions, 0 deletions
diff --git a/crawl-ref/source/mapdef.h b/crawl-ref/source/mapdef.h
index 9ff325bcca..d1a0316aad 100644
--- a/crawl-ref/source/mapdef.h
+++ b/crawl-ref/source/mapdef.h
@@ -167,6 +167,7 @@ struct map_marker_spec : public map_transformer
     map_transformer *clone() const;
 };
 
+class map_def;
 class map_lines
 {
 public:
@@ -260,6 +261,7 @@ private:
     friend class subst_spec;
     friend class nsubst_spec;
     friend class shuffle_spec;
+    friend class map_marker_spec;
     
 private:
     std::vector<map_transformer *> transforms;