-#ifndef ptable_walk
-STATIC void ptable_walk(pTHX_ ptable * const t, void (*cb)(pTHX_ ptable_ent *ent, void *userdata), void *userdata) {
+#endif /* PTABLE_NEED_DELETE */
+
+#if PTABLE_NEED_WALK && !defined(ptable_walk)
+
+static void ptable_walk(pTHX_ ptable * const t, void (*cb)(pTHX_ ptable_ent *ent, void *userdata), void *userdata) {