diff --git a/include/sys/zfs_bootenv.h b/include/sys/zfs_bootenv.h
index 074e7e759..4c4b2ab1a 100644
--- a/include/sys/zfs_bootenv.h
+++ b/include/sys/zfs_bootenv.h
@@ -31,6 +31,7 @@ extern "C" {
 #define	BE_FREEBSD_VENDOR	"freebsd"
 #define	BE_GRUB_VENDOR		"grub"
 #define	BE_LINUX_VENDOR		"linux"
+#define	BE_POSIX_VENDOR		"posix"
 
 #include <sys/zfs_bootenv_os.h>
 
diff --git a/lib/libzpool/include/Makefile.am b/lib/libzpool/include/Makefile.am
index 420b6f646..6cfa2d5ce 100644
--- a/lib/libzpool/include/Makefile.am
+++ b/lib/libzpool/include/Makefile.am
@@ -3,5 +3,6 @@ libzpool_sys_HEADERS = \
 	%D%/sys/abd_os.h \
 	%D%/sys/abd_impl_os.h \
 	%D%/sys/trace_zfs.h \
+	%D%/sys/zfs_bootenv_os.h \
 	%D%/sys/zfs_context_os.h \
 	%D%/sys/zfs_debug_os.h
diff --git a/lib/libzpool/include/sys/zfs_bootenv_os.h b/lib/libzpool/include/sys/zfs_bootenv_os.h
new file mode 100644
index 000000000..44afbb6f5
--- /dev/null
+++ b/lib/libzpool/include/sys/zfs_bootenv_os.h
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: CDDL-1.0
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or https://opensource.org/licenses/CDDL-1.0.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2025, Rob Norris <robn@despairlabs.com>
+ */
+
+#ifndef _ZFS_BOOTENV_OS_H
+#define	_ZFS_BOOTENV_OS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define	BOOTENV_OS		BE_POSIX_VENDOR
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _ZFS_BOOTENV_OS_H */