diff --git a/lib/lvmpolld/polldaemon.h b/lib/lvmpolld/polldaemon.h
index 40ce7a546..ebb90bcb0 100644
--- a/lib/lvmpolld/polldaemon.h
+++ b/lib/lvmpolld/polldaemon.h
@@ -59,12 +59,12 @@ struct daemon_parms {
 	unsigned progress_display;
 	const char *progress_title;
 	uint64_t lv_type;
-	struct poll_functions *poll_fns;
+	const struct poll_functions *poll_fns;
 	char devicesfile[128];
 };
 
 int poll_daemon(struct cmd_context *cmd, unsigned background,
-		uint64_t lv_type, struct poll_functions *poll_fns,
+		uint64_t lv_type, const struct poll_functions *poll_fns,
 		const char *progress_title, struct poll_operation_id *id);
 
 progress_t poll_mirror_progress(struct cmd_context *cmd,
diff --git a/tools/lvconvert.c b/tools/lvconvert.c
index 6cd26f0e0..674bfe537 100644
--- a/tools/lvconvert.c
+++ b/tools/lvconvert.c
@@ -277,17 +277,17 @@ static int _read_params(struct cmd_context *cmd, struct lvconvert_params *lp)
 }
 
 
-static struct poll_functions _lvconvert_mirror_fns = {
+static const struct poll_functions _lvconvert_mirror_fns = {
 	.poll_progress = poll_mirror_progress,
 	.finish_copy = lvconvert_mirror_finish,
 };
 
-static struct poll_functions _lvconvert_merge_fns = {
+static const struct poll_functions _lvconvert_merge_fns = {
 	.poll_progress = poll_merge_progress,
 	.finish_copy = lvconvert_merge_finish,
 };
 
-static struct poll_functions _lvconvert_thin_merge_fns = {
+static const struct poll_functions _lvconvert_thin_merge_fns = {
 	.poll_progress = poll_thin_merge_progress,
 	.finish_copy = lvconvert_merge_finish,
 };
diff --git a/tools/lvpoll.c b/tools/lvpoll.c
index a4a698b8e..b12b96d2b 100644
--- a/tools/lvpoll.c
+++ b/tools/lvpoll.c
@@ -19,23 +19,23 @@
 #include "lvconvert_poll.h"
 #include "daemons/lvmpolld/polling_ops.h"
 
-static struct poll_functions _pvmove_fns = {
+static const struct poll_functions _pvmove_fns = {
 	.poll_progress = poll_mirror_progress,
 	.update_metadata = pvmove_update_metadata,
 	.finish_copy = pvmove_finish
 };
 
-static struct poll_functions _convert_fns = {
+static const struct poll_functions _convert_fns = {
 	.poll_progress = poll_mirror_progress,
 	.finish_copy = lvconvert_mirror_finish
 };
 
-static struct poll_functions _merge_fns = {
+static const struct poll_functions _merge_fns = {
 	.poll_progress = poll_merge_progress,
 	.finish_copy = lvconvert_merge_finish
 };
 
-static struct poll_functions _thin_merge_fns = {
+static const struct poll_functions _thin_merge_fns = {
 	.poll_progress = poll_thin_merge_progress,
 	.finish_copy = lvconvert_merge_finish
 };
diff --git a/tools/polldaemon.c b/tools/polldaemon.c
index b6392c340..730dfbcbb 100644
--- a/tools/polldaemon.c
+++ b/tools/polldaemon.c
@@ -648,7 +648,7 @@ static int _poll_daemon(struct cmd_context *cmd, struct poll_operation_id *id,
 }
 
 static int _daemon_parms_init(struct cmd_context *cmd, struct daemon_parms *parms,
-			      unsigned background, struct poll_functions *poll_fns,
+			      unsigned background, const struct poll_functions *poll_fns,
 			      const char *progress_title, uint64_t lv_type)
 {
 	sign_t interval_sign;
@@ -687,7 +687,7 @@ static int _daemon_parms_init(struct cmd_context *cmd, struct daemon_parms *parm
 }
 
 int poll_daemon(struct cmd_context *cmd, unsigned background,
-		uint64_t lv_type, struct poll_functions *poll_fns,
+		uint64_t lv_type, const struct poll_functions *poll_fns,
 		const char *progress_title, struct poll_operation_id *id)
 {
 	struct daemon_parms parms;
diff --git a/tools/pvmove.c b/tools/pvmove.c
index c5f9d545e..a43ad006e 100644
--- a/tools/pvmove.c
+++ b/tools/pvmove.c
@@ -786,7 +786,7 @@ static int _pvmove_read_single(struct cmd_context *cmd,
 	return ret;
 }
 
-static struct poll_functions _pvmove_fns = {
+static const struct poll_functions _pvmove_fns = {
 	.get_copy_name_from_lv = get_pvmove_pvname_from_lv_mirr,
 	.poll_progress = poll_mirror_progress,
 	.update_metadata = pvmove_update_metadata,