diff --git a/ObsoleteFiles.inc b/ObsoleteFiles.inc
--- a/ObsoleteFiles.inc
+++ b/ObsoleteFiles.inc
@@ -51,6 +51,9 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20250615: don't install man page for absent function
+OLD_FILES+=usr/share/man/man9/vm_map_simplify_entry.9.gz
+
 # 20250521: don't install zoneinfo version
 OLD_FILES+=usr/share/zoneinfo/version
 
diff --git a/share/man/man9/Makefile b/share/man/man9/Makefile
--- a/share/man/man9/Makefile
+++ b/share/man/man9/Makefile
@@ -393,7 +393,6 @@
 	vm_map_max.9 \
 	vm_map_protect.9 \
 	vm_map_remove.9 \
-	vm_map_simplify_entry.9 \
 	vm_map_stack.9 \
 	vm_map_submap.9 \
 	vm_map_sync.9 \
diff --git a/share/man/man9/vm_map.9 b/share/man/man9/vm_map.9
--- a/share/man/man9/vm_map.9
+++ b/share/man/man9/vm_map.9
@@ -323,7 +323,6 @@
 .Xr vm_map_pmap 9 ,
 .Xr vm_map_protect 9 ,
 .Xr vm_map_remove 9 ,
-.Xr vm_map_simplify_entry 9 ,
 .Xr vm_map_stack 9 ,
 .Xr vm_map_submap 9 ,
 .Xr vm_map_sync 9 ,
diff --git a/share/man/man9/vm_map_simplify_entry.9 b/share/man/man9/vm_map_simplify_entry.9
deleted file mode 100644
--- a/share/man/man9/vm_map_simplify_entry.9
+++ /dev/null
@@ -1,59 +0,0 @@
-.\"
-.\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.Dd July 19, 2003
-.Dt VM_MAP_SIMPLIFY_ENTRY 9
-.Os
-.Sh NAME
-.Nm vm_map_simplify_entry
-.Nd simplify a
-.Vt vm_map_entry
-.Sh SYNOPSIS
-.In sys/param.h
-.In vm/vm.h
-.In vm/vm_map.h
-.Ft void
-.Fn vm_map_simplify_entry "vm_map_t map" "vm_map_entry_t entry"
-.Sh DESCRIPTION
-The
-.Fn vm_map_simplify_entry
-function simplifies the given
-.Fa entry
-by merging with either neighbour.
-The
-.Fa map
-must be locked upon entry.
-.Pp
-This function also has the ability to merge with both neighbours.
-.Pp
-This function guarantees that the passed entry remains valid, although
-possibly extended.
-.Sh SEE ALSO
-.Xr vm_map 9 ,
-.Xr vm_map_insert 9 ,
-.Xr vm_map_remove 9
-.Sh AUTHORS
-This manual page was written by
-.An Bruce M Simpson Aq Mt bms@spc.org .