diff --git a/WHATS_NEW b/WHATS_NEW
index 987b020a3..62eace74b 100644
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,5 +1,6 @@
 Version 2.02.40 - 
 ================================
+  Prevent resizing an LV while lvconvert is using it.
   Avoid repeatedly wiping cache while VG_GLOBAL is held in vgscan & pvscan.
   Fix pvresize to not allow resize if PV has two metadata areas.
   Fix setting of volume limit count if converting to lvm1 format.
diff --git a/tools/lvresize.c b/tools/lvresize.c
index 4911da956..0a8bf7daf 100644
--- a/tools/lvresize.c
+++ b/tools/lvresize.c
@@ -308,6 +308,11 @@ static int _lvresize(struct cmd_context *cmd, struct volume_group *vg,
 		return ECMD_FAILED;
 	}
 
+	if (lv->status & CONVERTING) {
+		log_error("Can't resize %s while lvconvert in progress", lv->name);
+		return ECMD_FAILED;
+	}
+
 	alloc = arg_uint_value(cmd, alloc_ARG, lv->alloc);
 
 	if (lp->size) {