diff --git a/src/resolvers.c b/src/resolvers.c
index 1704d7227..3b9a246e6 100644
--- a/src/resolvers.c
+++ b/src/resolvers.c
@@ -2470,6 +2470,8 @@ static int resolvers_finalize_config(void)
 				err_code |= (ERR_ALERT|ERR_ABORT);
 				continue;
 			}
+
+			srv->flags |= SRV_F_NON_PURGEABLE;
 		}
 	}