diff --git a/src/tcpcheck.c b/src/tcpcheck.c
index 59d7688..587a609 100644
--- a/src/tcpcheck.c
+++ b/src/tcpcheck.c
@@ -3533,10 +3533,12 @@
 		new->send.http.vsn = IST_NULL;
 	}
 
-	free_tcpcheck_http_hdrs(&old->send.http.hdrs);
-	list_for_each_entry_safe(hdr, bhdr, &new->send.http.hdrs, list) {
-		LIST_DELETE(&hdr->list);
-		LIST_APPEND(&old->send.http.hdrs, &hdr->list);
+	if (!LIST_ISEMPTY(&new->send.http.hdrs)) {
+		free_tcpcheck_http_hdrs(&old->send.http.hdrs);
+		list_for_each_entry_safe(hdr, bhdr, &new->send.http.hdrs, list) {
+			LIST_DELETE(&hdr->list);
+			LIST_APPEND(&old->send.http.hdrs, &hdr->list);
+		}
 	}
 
 	if (!(new->send.http.flags & TCPCHK_SND_HTTP_FL_BODY_FMT) && isttest(new->send.http.body)) {