diff --git a/libs/ldns/ldns/config.h.in b/libs/ldns/ldns/config.h.in
index 473f1ff7c5..81783db33b 100644
--- a/libs/ldns/ldns/config.h.in
+++ b/libs/ldns/ldns/config.h.in
@@ -467,4 +467,10 @@ size_t strlcpy(char *dst, const char *src, size_t siz);
 #ifndef HAVE_STRTOUL
 #define strtoul (unsigned long)strtol
 #endif
+#ifdef HAVE_B64_PTON
+#define ldns_b64_pton b64_pton
+#endif
+#ifdef HAVE_B64_NTOP
+#define ldns_b64_ntop b64_ntop
+#endif