diff -r 0923c036b913 -r f819fe5e20f5 src/map.c
--- a/src/map.c	Tue Jan 23 19:23:34 2018 +0100
+++ b/src/map.c	Wed May 02 16:14:40 2018 +0200
@@ -86,7 +86,11 @@
     UcxMapIterator iter = ucx_map_iterator(map);
     void *val;
     UCX_MAP_FOREACH(key, val, iter) {
-        destr(val);
+        if (destr) {
+            destr(val);
+        } else {
+            map->allocator->free(val, NULL);
+        }
     }
 }