diff --git a/WHATS_NEW b/WHATS_NEW
index 558162759..9053a5c78 100644
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,5 +1,6 @@
 Version 2.02.73 - 
 ================================
+  Require logical volume(s) to be explicitly named for lvconvert --merge.
   Avoid changing aligned pe_start as a side-effect of very verbose logging.
   Fix 'void*' arithmetic warnings in dbg_malloc.c.
   Fix 'void*' arithmetic warning in some functions from libdm-iface.c.
diff --git a/test/t-snapshot-merge.sh b/test/t-snapshot-merge.sh
index 982e06594..72d96daf2 100755
--- a/test/t-snapshot-merge.sh
+++ b/test/t-snapshot-merge.sh
@@ -49,6 +49,8 @@ setup_merge $vg $lv1
 # now that snapshot LV is created: test if snapshot-merge target is available
 $(dmsetup targets | grep -q snapshot-merge) || exit 200
 lvs -a
+# make sure lvconvert --merge requires explicit LV listing
+not lvconvert --merge 2>err
 lvconvert --merge $vg/$(snap_lv_name_ $lv1)
 lvremove -f $vg/$lv1
 
diff --git a/tools/lvconvert.c b/tools/lvconvert.c
index ff9bab383..1f17619ee 100644
--- a/tools/lvconvert.c
+++ b/tools/lvconvert.c
@@ -1738,9 +1738,14 @@ int lvconvert(struct cmd_context * cmd, int argc, char **argv)
 		return EINVALID_CMD_LINE;
 	}
 
-	if (lp.merge)
+	if (lp.merge) {
+		if (!argc) {
+			log_error("Please provide logical volume path");
+			return EINVALID_CMD_LINE;
+		}
 		return process_each_lv(cmd, argc, argv, READ_FOR_UPDATE, &lp,
 				       &lvconvert_merge_single);
+	}
 
 	return lvconvert_single(cmd, &lp);
 }