diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_deadlist.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_deadlist.c
index 203815a750e0..ff06c9e93cc6 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_deadlist.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_deadlist.c
@@ -85,7 +85,7 @@ dsl_deadlist_load_tree(dsl_deadlist_t *dl)
 	    zap_cursor_retrieve(&zc, &za) == 0;
 	    zap_cursor_advance(&zc)) {
 		dsl_deadlist_entry_t *dle = kmem_alloc(sizeof (*dle), KM_SLEEP);
-		dle->dle_mintxg = strtonum(za.za_name, NULL);
+		dle->dle_mintxg = zfs_strtonum(za.za_name, NULL);
 		VERIFY3U(0, ==, bpobj_open(&dle->dle_bpobj, dl->dl_os,
 		    za.za_first_integer));
 		avl_add(&dl->dl_tree, dle);
@@ -490,7 +490,7 @@ dsl_deadlist_merge(dsl_deadlist_t *dl, uint64_t obj, dmu_tx_t *tx)
 	for (zap_cursor_init(&zc, dl->dl_os, obj);
 	    zap_cursor_retrieve(&zc, &za) == 0;
 	    zap_cursor_advance(&zc)) {
-		uint64_t mintxg = strtonum(za.za_name, NULL);
+		uint64_t mintxg = zfs_strtonum(za.za_name, NULL);
 		dsl_deadlist_insert_bpobj(dl, za.za_first_integer, mintxg, tx);
 		VERIFY3U(0, ==, zap_remove_int(dl->dl_os, obj, mintxg, tx));
 	}
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_scan.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_scan.c
index 1061cf686334..ba5b609249da 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_scan.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_scan.c
@@ -1389,7 +1389,7 @@ dsl_scan_visit(dsl_scan_t *scn, dmu_tx_t *tx)
 		dsl_dataset_t *ds;
 		uint64_t dsobj;
 
-		dsobj = strtonum(za.za_name, NULL);
+		dsobj = zfs_strtonum(za.za_name, NULL);
 		VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset,
 		    scn->scn_phys.scn_queue_obj, dsobj, tx));
 
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_userhold.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_userhold.c
index 54a15e1669a5..a0484a0cd9ed 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_userhold.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_userhold.c
@@ -340,7 +340,7 @@ static int
 dsl_dataset_hold_obj_string(dsl_pool_t *dp, const char *dsobj, void *tag,
     dsl_dataset_t **dsp)
 {
-	return (dsl_dataset_hold_obj(dp, strtonum(dsobj, NULL), tag, dsp));
+	return (dsl_dataset_hold_obj(dp, zfs_strtonum(dsobj, NULL), tag, dsp));
 }
 
 static int
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_errlog.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_errlog.c
index 168f3acc2e8e..8ce780537abb 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_errlog.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa_errlog.c
@@ -73,13 +73,13 @@ bookmark_to_name(zbookmark_phys_t *zb, char *buf, size_t len)
 static void
 name_to_bookmark(char *buf, zbookmark_phys_t *zb)
 {
-	zb->zb_objset = strtonum(buf, &buf);
+	zb->zb_objset = zfs_strtonum(buf, &buf);
 	ASSERT(*buf == ':');
-	zb->zb_object = strtonum(buf + 1, &buf);
+	zb->zb_object = zfs_strtonum(buf + 1, &buf);
 	ASSERT(*buf == ':');
-	zb->zb_level = (int)strtonum(buf + 1, &buf);
+	zb->zb_level = (int)zfs_strtonum(buf + 1, &buf);
 	ASSERT(*buf == ':');
-	zb->zb_blkid = strtonum(buf + 1, &buf);
+	zb->zb_blkid = zfs_strtonum(buf + 1, &buf);
 	ASSERT(*buf == '\0');
 }
 #endif
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/spa.h b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/spa.h
index e1c4aea77ea5..43c2135a8eee 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/spa.h
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/sys/spa.h
@@ -848,7 +848,6 @@ extern void zfs_blkptr_verify(spa_t *spa, const blkptr_t *bp);
 
 extern int spa_mode(spa_t *spa);
 extern uint64_t zfs_strtonum(const char *str, char **nptr);
-#define	strtonum(str, nptr)	zfs_strtonum((str), (nptr))
 
 extern char *spa_his_ievent_table[];
 
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
index 7dffac1d00da..154704bbe472 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
@@ -630,7 +630,7 @@ fuidstr_to_sid(zfsvfs_t *zfsvfs, const char *fuidstr,
 	uint64_t fuid;
 	const char *domain;
 
-	fuid = strtonum(fuidstr, NULL);
+	fuid = zfs_strtonum(fuidstr, NULL);
 
 	domain = zfs_fuid_find_by_idx(zfsvfs, FUID_INDEX(fuid));
 	if (domain)