diff --git a/stand/libsa/zfs/Makefile.inc b/stand/libsa/zfs/Makefile.inc
--- a/stand/libsa/zfs/Makefile.inc
+++ b/stand/libsa/zfs/Makefile.inc
@@ -11,7 +11,7 @@
 .PATH:		${OZFS}/module/icp/algs/blake3
 ZFS_SRC=	zfs.c nvlist.c skein.c skein_block.c list.c
 ZFS_SRC+=	zfs_zstd.c
-ZFS_SRC+=	blake3.c blake3_generic.c blake3_impl_hack.c
+ZFS_SRC+=	blake3.c blake3_generic.c blake3_impl.c
 ZSTD_SRC+=	entropy_common.c error_private.c
 ZSTD_SRC+=	fse_decompress.c hist.c
 ZSTD_SRC+=	huf_decompress.c pool.c xxhash.c
@@ -49,7 +49,7 @@
 
 CFLAGS_EARLY.blake3.c+= ${ZFS_EARLY} -DOMIT_SIMD
 CFLAGS_EARLY.blake3_generic.c+= ${ZFS_EARLY} -DOMIT_SIMD
-CFLAGS_EARLY.blake3_impl_hack.c+= ${ZFS_EARLY} -DOMIT_SIMD
+CFLAGS_EARLY.blake3_impl.c+= ${ZFS_EARLY} -DOMIT_SIMD
 CFLAGS_EARLY.list.c+= ${ZFS_EARLY}
 CFLAGS_EARLY.zfs_zstd.c+= ${ZFS_EARLY}
 CFLAGS_EARLY.nvlist.c+= ${ZFS_EARLY}
@@ -78,7 +78,7 @@
 
 CFLAGS.zfs_zstd.c+= -DIN_BASE -DIN_LIBSA
 
-CFLAGS.blake3_impl_hack.c+= -I${OZFS}/module/icp/algs/blake3 -I${OZFS}/module/icp/include
+CFLAGS.blake3_impl.c+= -I${OZFS}/module/icp/algs/blake3 -I${OZFS}/module/icp/include
 
 # Do not unroll skein loops, reduce code size
 CFLAGS.skein_block.c+=	-DSKEIN_LOOP=111
diff --git a/stand/libsa/zfs/blake3_impl_hack.c b/stand/libsa/zfs/blake3_impl_hack.c
deleted file mode 100644
--- a/stand/libsa/zfs/blake3_impl_hack.c
+++ /dev/null
@@ -1,18 +0,0 @@
-/*
- * Copyright 2022, Netflix, Inc
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
-
-/*
- * Hack for aarch64...  Not sure why isspace isn't defined, but it sure doesn't
- * belong here.
- */
-#ifndef isspace
-static __inline int isspace(int c)
-{
-    return c == ' ' || (c >= 0x9 && c <= 0xd);
-}
-#endif
-
-#include "blake3_impl.c"
diff --git a/sys/contrib/openzfs/include/os/freebsd/spl/sys/ctype.h b/sys/contrib/openzfs/include/os/freebsd/spl/sys/ctype.h
--- a/sys/contrib/openzfs/include/os/freebsd/spl/sys/ctype.h
+++ b/sys/contrib/openzfs/include/os/freebsd/spl/sys/ctype.h
@@ -39,5 +39,6 @@
 		((C) >= 0x3A && (C) <= 0x40) ||				\
 		((C) >= 0x5B && (C) <= 0x60) ||				\
 		((C) >= 0x7B && (C) <= 0x7E))
+#define isspace(C)	((C) == 0x20 || ((C) >= 0x9 && (C) <= 0xD))
 
 #endif