diff --git a/lib/error/errseg.c b/lib/error/errseg.c
index add1df8cb..41e451b9c 100644
--- a/lib/error/errseg.c
+++ b/lib/error/errseg.c
@@ -99,7 +99,7 @@ static struct segtype_handler _error_ops = {
 
 struct segment_type *init_error_segtype(struct cmd_context *cmd)
 {
-	struct segment_type *segtype = dm_malloc(sizeof(*segtype));
+	struct segment_type *segtype = dm_zalloc(sizeof(*segtype));
 
 	if (!segtype)
 		return_NULL;
diff --git a/lib/freeseg/freeseg.c b/lib/freeseg/freeseg.c
index 8e73be0c6..6fbad7ec7 100644
--- a/lib/freeseg/freeseg.c
+++ b/lib/freeseg/freeseg.c
@@ -43,7 +43,7 @@ static struct segtype_handler _freeseg_ops = {
 
 struct segment_type *init_free_segtype(struct cmd_context *cmd)
 {
-	struct segment_type *segtype = dm_malloc(sizeof(*segtype));
+	struct segment_type *segtype = dm_zalloc(sizeof(*segtype));
 
 	if (!segtype)
 		return_NULL;
diff --git a/lib/mirror/mirrored.c b/lib/mirror/mirrored.c
index 9da8efaa6..3c68adab1 100644
--- a/lib/mirror/mirrored.c
+++ b/lib/mirror/mirrored.c
@@ -630,7 +630,7 @@ struct segment_type *init_segtype(struct cmd_context *cmd);
 struct segment_type *init_segtype(struct cmd_context *cmd)
 #endif
 {
-	struct segment_type *segtype = dm_malloc(sizeof(*segtype));
+	struct segment_type *segtype = dm_zalloc(sizeof(*segtype));
 
 	if (!segtype)
 		return_NULL;
diff --git a/lib/replicator/replicator.c b/lib/replicator/replicator.c
index 26a5cf1c0..2be49c2fc 100644
--- a/lib/replicator/replicator.c
+++ b/lib/replicator/replicator.c
@@ -760,7 +760,7 @@ int init_multiple_segtype(struct segtype_library *seglib)
 {
 	struct segment_type *segtype;
 
-	if (!(segtype = dm_malloc(sizeof(*segtype))))
+	if (!(segtype = dm_zalloc(sizeof(*segtype))))
 		return_0;
 
 	segtype->ops = &_replicator_ops;
@@ -773,7 +773,7 @@ int init_multiple_segtype(struct segtype_library *seglib)
 
 	log_very_verbose("Initialised segtype: " REPLICATOR_MODULE);
 
-	if (!(segtype = dm_malloc(sizeof(*segtype))))
+	if (!(segtype = dm_zalloc(sizeof(*segtype))))
 		return_0;
 
 	segtype->ops = &_replicator_dev_ops;
diff --git a/lib/snapshot/snapshot.c b/lib/snapshot/snapshot.c
index af5d70895..1b8b20ff5 100644
--- a/lib/snapshot/snapshot.c
+++ b/lib/snapshot/snapshot.c
@@ -249,7 +249,7 @@ struct segment_type *init_segtype(struct cmd_context *cmd);
 struct segment_type *init_segtype(struct cmd_context *cmd)
 #endif
 {
-	struct segment_type *segtype = dm_malloc(sizeof(*segtype));
+	struct segment_type *segtype = dm_zalloc(sizeof(*segtype));
 
 	if (!segtype)
 		return_NULL;
diff --git a/lib/striped/striped.c b/lib/striped/striped.c
index 51bf24a1e..4de4a1876 100644
--- a/lib/striped/striped.c
+++ b/lib/striped/striped.c
@@ -220,7 +220,7 @@ static struct segtype_handler _striped_ops = {
 
 struct segment_type *init_striped_segtype(struct cmd_context *cmd)
 {
-	struct segment_type *segtype = dm_malloc(sizeof(*segtype));
+	struct segment_type *segtype = dm_zalloc(sizeof(*segtype));
 
 	if (!segtype)
 		return_NULL;
diff --git a/lib/unknown/unknown.c b/lib/unknown/unknown.c
index 332ae99e0..b2183717a 100644
--- a/lib/unknown/unknown.c
+++ b/lib/unknown/unknown.c
@@ -91,7 +91,7 @@ static struct segtype_handler _unknown_ops = {
 
 struct segment_type *init_unknown_segtype(struct cmd_context *cmd, const char *name)
 {
-	struct segment_type *segtype = dm_malloc(sizeof(*segtype));
+	struct segment_type *segtype = dm_zalloc(sizeof(*segtype));
 
 	if (!segtype)
 		return_NULL;
diff --git a/lib/zero/zero.c b/lib/zero/zero.c
index 16ce66c40..471bc11f9 100644
--- a/lib/zero/zero.c
+++ b/lib/zero/zero.c
@@ -96,7 +96,7 @@ static struct segtype_handler _zero_ops = {
 
 struct segment_type *init_zero_segtype(struct cmd_context *cmd)
 {
-	struct segment_type *segtype = dm_malloc(sizeof(*segtype));
+	struct segment_type *segtype = dm_zalloc(sizeof(*segtype));
 
 	if (!segtype)
 		return_NULL;