diff -up mutt-1.10.1/headers.c.mutt-1.9.3-1_coverity_87 mutt-1.10.1/headers.c
--- mutt-1.10.1/headers.c.mutt-1.9.3-1_coverity_87	2018-10-25 15:31:00.153489193 +0200
+++ mutt-1.10.1/headers.c	2018-10-25 15:31:22.142823598 +0200
@@ -283,7 +283,7 @@ int mutt_label_message(HEADER *hdr)
 
   *buf = '\0';
   if (hdr != NULL && hdr->env->x_label != NULL) {
-    strncpy(buf, hdr->env->x_label, LONG_STRING);
+    strfcpy(buf, hdr->env->x_label, LONG_STRING);
   }
 
   if (mutt_get_field("Label: ", buf, sizeof(buf), MUTT_LABEL /* | MUTT_CLEAR */) != 0)