diff --git a/src/proto_http.c b/src/proto_http.c
index 8834532..054c6ac 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -6907,7 +6907,7 @@
 					txn->flags &= ~TX_SCK_MASK;
 					txn->flags |= TX_SCK_REPLACED;
 				}
-				else if (srv && srv && (t->be->ck_opts & PR_CK_PFX)) {
+				else if (srv && srv->cookie && (t->be->ck_opts & PR_CK_PFX)) {
 					/* insert the cookie name associated with this server
 					 * before existing cookie, and insert a delimiter between them..
 					 */