diff --git a/lib/libspl/Makefile.am b/lib/libspl/Makefile.am
index 4c7eb722bc..c18b67551a 100644
--- a/lib/libspl/Makefile.am
+++ b/lib/libspl/Makefile.am
@@ -14,7 +14,6 @@ libspl_la_SOURCES = \
 	${top_srcdir}/lib/libspl/strlcat.c \
 	${top_srcdir}/lib/libspl/strlcpy.c \
 	${top_srcdir}/lib/libspl/strnlen.c \
-	${top_srcdir}/lib/libspl/sunddi.c \
 	${top_srcdir}/lib/libspl/u8_textprep.c \
 	${top_srcdir}/lib/libspl/zone.c \
 	${top_srcdir}/lib/libspl/include/sys/list.h \
diff --git a/lib/libspl/include/sys/sunddi.h b/lib/libspl/include/sys/sunddi.h
index 06648e4c4c..ccd2b29b9b 100644
--- a/lib/libspl/include/sys/sunddi.h
+++ b/lib/libspl/include/sys/sunddi.h
@@ -26,54 +26,4 @@
 #ifndef	_SYS_SUNDDI_H
 #define	_SYS_SUNDDI_H
 
-#include <sys/types.h>
-
-/*
- * Generic Sun DDI definitions.
- */
-#define DDI_SUCCESS		(0)   /* successful return */
-#define DDI_FAILURE		(-1)  /* unsuccessful return */
-#define DDI_NOT_WELL_FORMED	(-2)  /* A dev_info node is not valid */
-#define DDI_EAGAIN		(-3)  /* not enough interrupt resources */
-#define DDI_EINVAL		(-4)  /* invalid request or arguments */
-#define DDI_ENOTSUP		(-5)  /* operation is not supported */
-#define DDI_EPENDING		(-6)  /* operation or an event is pending */
-
-/*
- * General-purpose DDI error return value definitions
- */
-#define DDI_ENOMEM		1     /* memory not available */
-#define DDI_EBUSY		2     /* busy */
-#define DDI_ETRANSPORT		3     /* transport down */
-#define DDI_ECONTEXT		4     /* context error */
-
-/*
- * DDI_DEV_T_NONE:      When creating, property is not associated with
- *                      particular dev_t.
- * DDI_DEV_T_ANY:       Wildcard dev_t when searching properties.
- */
-#define DDI_DEV_T_NONE		((dev_t)-1)
-#define DDI_DEV_T_ANY		((dev_t)-2)
-
-/*
- * Property flags:
- */
-#define DDI_PROP_DONTPASS	0x0001  /* Don't pass request to parent */
-#define DDI_PROP_CANSLEEP	0x0002  /* Memory allocation may sleep */
-
-typedef struct dev_info {
-        major_t di_major;
-        minor_t di_minor;
-        dev_t di_dev;
-} dev_info_t;
-
-extern int ddi_strtoul(const char *, char **, int, unsigned long *);
-extern int ddi_strtol(const char *, char **, int, long *);
-extern int ddi_strtoull(const char *, char **, int, unsigned long long *);
-extern int ddi_strtoll(const char *, char **, int, long long *);
-
-extern dev_info_t *ddi_root_node(void);
-extern int ddi_prop_lookup_string(dev_t, dev_info_t *, uint_t, char *, char **);
-extern void ddi_prop_free(void *);
-
 #endif	/* _SYS_SUNDDI_H */
diff --git a/lib/libspl/sunddi.c b/lib/libspl/sunddi.c
deleted file mode 100644
index cd98d4e1d5..0000000000
--- a/lib/libspl/sunddi.c
+++ /dev/null
@@ -1,108 +0,0 @@
-/*
- * 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 http://www.opensolaris.org/os/licensing.
- * 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 2008 Sun Microsystems, Inc.  All rights reserved.
- * Use is subject to license terms.
- */
-
-#include <stdlib.h>
-#include <errno.h>
-#include <sys/sunddi.h>
-
-int
-ddi_strtoul(const char *str, char **endptr, int base,
-	    unsigned long *result)
-{
-	unsigned long val;
-
-	errno = 0;
-	val = strtoul(str, endptr, base);
-	if (errno == 0)
-		*result = val;
-
-	return errno;
-}
-
-int
-ddi_strtol(const char *str, char **endptr, int base,
-	   long *result)
-{
-	long val;
-
-	errno = 0;
-	val = strtol(str, endptr, base);
-	if (errno == 0)
-		*result = val;
-
-	return errno;
-}
-
-int
-ddi_strtoull(const char *str, char **endptr, int base,
-	     unsigned long long *result)
-{
-	unsigned long long val;
-
-	errno = 0;
-	val = strtoull(str, endptr, base);
-	if (errno == 0)
-		*result = val;
-
-	return errno;
-}
-
-int
-ddi_strtoll(const char *str, char **endptr, int base,
-	    long long *result)
-{
-	long long val;
-
-	errno = 0;
-	val = strtoll(str, endptr, base);
-	if (errno == 0)
-		*result = val;
-
-	return errno;
-}
-
-/* FIXME: Unimplemented */
-dev_info_t *
-ddi_root_node(void)
-{
-	return NULL;
-}
-
-/* FIXME: Unimplemented */
-int
-ddi_prop_lookup_string(dev_t match_dev, dev_info_t *dip, uint_t flags,
-                       char *name, char **data)
-{
-	*data = NULL;
-	return ENOSYS;
-}
-
-/* FIXME: Unimplemented */
-void
-ddi_prop_free(void *datap)
-{
-	return;
-}