diff --git a/lib/format_text/import-export.h b/lib/format_text/import-export.h
index da76852b7..e37f3a3a5 100644
--- a/lib/format_text/import-export.h
+++ b/lib/format_text/import-export.h
@@ -61,7 +61,7 @@ struct text_vg_version_ops {
 			       struct lvmcache_vgsummary *vgsummary);
 };
 
-struct text_vg_version_ops *text_vg_vsn1_init(void);
+const struct text_vg_version_ops *text_vg_vsn1_init(void);
 
 int print_flags(char *buffer, size_t size, enum pv_vg_lv_e type, int mask, uint64_t status);
 int read_flags(uint64_t *status, enum pv_vg_lv_e type, int mask, const struct dm_config_value *cv);
diff --git a/lib/format_text/import.c b/lib/format_text/import.c
index a3735369d..5f74ae420 100644
--- a/lib/format_text/import.c
+++ b/lib/format_text/import.c
@@ -19,7 +19,7 @@
 #include "import-export.h"
 
 /* FIXME Use tidier inclusion method */
-static struct text_vg_version_ops *(_text_vsn_list[2]);
+static const struct text_vg_version_ops *(_text_vsn_list[2]);
 
 static int _text_import_initialised = 0;
 
@@ -45,7 +45,7 @@ int text_read_metadata_summary(const struct format_type *fmt,
 		       struct lvmcache_vgsummary *vgsummary)
 {
 	struct dm_config_tree *cft;
-	struct text_vg_version_ops **vsn;
+	const struct text_vg_version_ops **vsn;
 	int r = 0;
 
 	_init_text_import();
@@ -117,7 +117,7 @@ struct volume_group *text_read_metadata(struct format_instance *fid,
 {
 	struct volume_group *vg = NULL;
 	struct dm_config_tree *cft;
-	struct text_vg_version_ops **vsn;
+	const struct text_vg_version_ops **vsn;
 	int skip_parse;
 
 	/*
@@ -219,7 +219,7 @@ static struct volume_group *_import_vg_from_config_tree(struct cmd_context *cmd,
 							const struct dm_config_tree *cft)
 {
 	struct volume_group *vg = NULL;
-	struct text_vg_version_ops **vsn;
+	const struct text_vg_version_ops **vsn;
 	int vg_missing;
 
 	_init_text_import();
@@ -256,7 +256,7 @@ struct volume_group *import_vg_from_config_tree(struct cmd_context *cmd,
 
 struct volume_group *vg_from_config_tree(struct cmd_context *cmd, const struct dm_config_tree *cft)
 {
-	static struct text_vg_version_ops *ops;
+	const struct text_vg_version_ops *ops;
 
 	_init_text_import();
 
diff --git a/lib/format_text/import_vsn1.c b/lib/format_text/import_vsn1.c
index dacf5573e..0bba8772a 100644
--- a/lib/format_text/import_vsn1.c
+++ b/lib/format_text/import_vsn1.c
@@ -1359,14 +1359,14 @@ static int _read_vgsummary(const struct format_type *fmt, const struct dm_config
 	return 1;
 }
 
-static struct text_vg_version_ops _vsn1_ops = {
+static const struct text_vg_version_ops _vsn1_ops = {
 	.check_version = _vsn1_check_version,
 	.read_vg = _read_vg,
 	.read_desc = _read_desc,
 	.read_vgsummary = _read_vgsummary
 };
 
-struct text_vg_version_ops *text_vg_vsn1_init(void)
+const struct text_vg_version_ops *text_vg_vsn1_init(void)
 {
 	return &_vsn1_ops;
 }