diff --git a/include/nng/supplemental/util/idhash.h b/include/nng/supplemental/util/idhash.h
deleted file mode 100644
index 7939ab1..0000000
--- a/include/nng/supplemental/util/idhash.h
+++ /dev/null
@@ -1,27 +0,0 @@
-//
-// Copyright 2024 Staysail Systems, Inc. <info@staysail.tech>
-//
-// This software is supplied under the terms of the MIT License, a
-// copy of which should be located in the distribution where this
-// file was obtained (LICENSE.txt).  A copy of the license may also be
-// found online at https://opensource.org/licenses/MIT.
-//
-
-#ifndef NNG_SUPPLEMENTAL_UTIL_IDHASH_H
-#define NNG_SUPPLEMENTAL_UTIL_IDHASH_H
-
-#include <nng/nng.h>
-
-typedef struct nng_id_map_s nng_id_map;
-
-#define NNG_MAP_RANDOM 1
-
-NNG_DECL int nng_id_map_alloc(
-    nng_id_map **map, uint64_t lo, uint64_t hi, int flags);
-NNG_DECL void  nng_id_map_free(nng_id_map *map);
-NNG_DECL void *nng_id_get(nng_id_map *, uint64_t);
-NNG_DECL int   nng_id_set(nng_id_map *, uint64_t, void *);
-NNG_DECL int   nng_id_alloc(nng_id_map *, uint64_t *, void *);
-NNG_DECL int   nng_id_remove(nng_id_map *, uint64_t);
-
-#endif // NNG_SUPPLEMENTAL_IDHASH_IDHASH_H
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