diff --git a/src/jrd/Relation.cpp b/src/jrd/Relation.cpp
index 9700abb7d0..21ecdc3213 100644
--- a/src/jrd/Relation.cpp
+++ b/src/jrd/Relation.cpp
@@ -519,5 +519,9 @@ void RelationPages::free(RelationPages*& nextFree)
 
 	rel_index_root = rel_data_pages = 0;
 	rel_slot_space = rel_pri_data_space = rel_sec_data_space = 0;
+	rel_last_free_pri_dp = 0;
 	rel_instance_id = 0;
+
+	dpMap.clear();
+	dpMapMark = 0;
 }