diff --git a/jectl.h b/jectl.h
index a956fdb..0ece2f2 100644
--- a/jectl.h
+++ b/jectl.h
@@ -45,7 +45,7 @@ extern libzfs_handle_t *lzh;
 extern const char *jepool;
 extern const char *jeroot;
 
-int get_property(zfs_handle_t *, const char *, char **);
+int get_property(zfs_handle_t *, const char *, const char **);
 
 zfs_handle_t * get_jail_dataset(const char *);
 zfs_handle_t * get_active_je(zfs_handle_t *);
diff --git a/jectl_dump.c b/jectl_dump.c
index 99a5800..630ca8d 100644
--- a/jectl_dump.c
+++ b/jectl_dump.c
@@ -35,7 +35,7 @@ static void
 print_je(zfs_handle_t *je)
 {
 	char *name;
-	char *value;
+	const char *value;
 	char buffer[ZFS_MAXPROPLEN];
 
 	name = strdup(zfs_get_name(je));
diff --git a/jectl_import.c b/jectl_import.c
index c810f1c..0e86b87 100644
--- a/jectl_import.c
+++ b/jectl_import.c
@@ -43,7 +43,7 @@ je_import(const char *import_name)
 	zfs_handle_t *zhp;
 	recvflags_t flags = { .nomount = 1 };
 	char name[ZFS_MAXPROPLEN];
-	char *default_je;
+	const char *default_je;
 	struct renameflags rflags = { 0 };
 
 	snprintf(name, sizeof(name), "%s/jectl.XXXXXX", jeroot);
diff --git a/jectl_update.c b/jectl_update.c
index 057fc92..d3aeeca 100644
--- a/jectl_update.c
+++ b/jectl_update.c
@@ -39,7 +39,7 @@ struct compare_info {
 static bool
 is_equal(zfs_handle_t *a, zfs_handle_t *b, const char *property)
 {
-	char *astr, *bstr;
+	const char *astr, *bstr;
 	int error1, error2;
 
 	error1 = get_property(a, property, &astr);
@@ -60,7 +60,7 @@ compare_je(zfs_handle_t *zhp, void *arg)
 {
 	struct compare_info *ci __unused;
 	zfs_handle_t *je;
-	char *v1, *v2;
+	const char *v1, *v2;
 
 	ci = arg;
 
diff --git a/jectl_util.c b/jectl_util.c
index 6c9c1c5..da33ef1 100644
--- a/jectl_util.c
+++ b/jectl_util.c
@@ -47,7 +47,7 @@ get_jail_dataset(const char *jailname)
 zfs_handle_t *
 get_active_je(zfs_handle_t *jds)
 {
-	char *je_name;
+	const char *je_name;
 
 	if (get_property(jds, "je:active", &je_name) != 0)
 		return (NULL);
@@ -56,7 +56,7 @@ get_active_je(zfs_handle_t *jds)
 }
 
 int
-get_property(zfs_handle_t *zhp, const char *property, char **val)
+get_property(zfs_handle_t *zhp, const char *property, const char **val)
 {
 	int error;
 	nvlist_t *nvl, *propval;
@@ -85,7 +85,7 @@ je_copy_user_props(zfs_handle_t *src, zfs_handle_t *target)
 {
 	struct nvpair *nvp;
 	nvlist_t *nvl, *propval, *nnvl;
-	char *value;
+	const char *value;
 
 	if (nvlist_alloc(&nnvl, NV_UNIQUE_NAME, 0) != 0)
 		return (ENOMEM);