diff -r d7129285ac32 -r dce9b8450656 src/hash_map.c
--- a/src/hash_map.c	Tue Mar 21 17:21:20 2023 +0100
+++ b/src/hash_map.c	Tue Mar 28 19:13:33 2023 +0200
@@ -428,15 +428,16 @@
     }
 
     // initialize base members
-    map->base.store_pointers = false;
     map->base.cl = &cx_hash_map_class;
     map->base.allocator = allocator;
     map->base.size = 0;
 
     if (itemsize > 0) {
+        map->base.store_pointers = false;
         map->base.itemsize = itemsize;
     } else {
-        cxMapStorePointers((CxMap *) map);
+        map->base.store_pointers = true;
+        map->base.itemsize = sizeof(void *);
     }
 
     return (CxMap *) map;