diff --git a/lib/metadata/lv_manip.c b/lib/metadata/lv_manip.c
index dfeb3ad91..01ab96bac 100644
--- a/lib/metadata/lv_manip.c
+++ b/lib/metadata/lv_manip.c
@@ -4089,6 +4089,7 @@ int lv_extend(struct logical_volume *lv,
 	uint32_t sub_lv_count;
 	uint32_t old_extents;
 	uint32_t new_extents;	/* Total logical size after extension. */
+	uint64_t raid_size;
 
 	log_very_verbose("Adding segment of type %s to LV %s.", segtype->name, lv->name);
 
@@ -4111,7 +4112,7 @@ int lv_extend(struct logical_volume *lv,
 	/* FIXME log_count should be 1 for mirrors */
 
 	if (segtype_is_raid(segtype) && !segtype_is_any_raid0(segtype)) {
-		uint64_t lv_size = ((uint64_t) lv->le_count + extents) * lv->vg->extent_size;
+		raid_size = ((uint64_t) lv->le_count + extents) * lv->vg->extent_size;
 
 		/*
 		 * The MD bitmap is limited to being able to track 2^21 regions.
@@ -4119,7 +4120,7 @@ int lv_extend(struct logical_volume *lv,
 		 * unless raid0/raid0_meta, which doesn't have a bitmap.
 		 */
 
-		region_size = raid_ensure_min_region_size(lv, lv_size, region_size);
+		region_size = raid_ensure_min_region_size(lv, raid_size, region_size);
 
 		if (first_seg(lv))
 			first_seg(lv)->region_size = region_size;
diff --git a/lib/metadata/metadata-exported.h b/lib/metadata/metadata-exported.h
index 05771d8f8..5fe169ce3 100644
--- a/lib/metadata/metadata-exported.h
+++ b/lib/metadata/metadata-exported.h
@@ -1222,7 +1222,7 @@ uint32_t raid_rmeta_extents_delta(struct cmd_context *cmd,
 				  uint32_t region_size, uint32_t extent_size);
 uint32_t raid_rimage_extents(const struct segment_type *segtype,
 			     uint32_t extents, uint32_t stripes, uint32_t data_copies);
-uint32_t raid_ensure_min_region_size(const struct logical_volume *lv, uint64_t lv_size, uint32_t region_size);
+uint32_t raid_ensure_min_region_size(const struct logical_volume *lv, uint64_t raid_size, uint32_t region_size);
 /* --  metadata/raid_manip.c */
 
 /* ++  metadata/cache_manip.c */
diff --git a/lib/metadata/raid_manip.c b/lib/metadata/raid_manip.c
index 0f0631fc4..eaafd650d 100644
--- a/lib/metadata/raid_manip.c
+++ b/lib/metadata/raid_manip.c
@@ -55,9 +55,9 @@ static int _check_num_areas_in_lv_segments(struct logical_volume *lv, unsigned n
  *
  * Pass in @lv_size, because funcion can be called with an empty @lv.
  */
-uint32_t raid_ensure_min_region_size(const struct logical_volume *lv, uint64_t lv_size, uint32_t region_size)
+uint32_t raid_ensure_min_region_size(const struct logical_volume *lv, uint64_t raid_size, uint32_t region_size)
 {
-	uint32_t min_region_size = lv_size / (1 << 21);
+	uint32_t min_region_size = raid_size / (1 << 21);
 	uint32_t region_size_sav = region_size;
 
 	while (region_size < min_region_size)