diff --git a/src/psl.c b/src/psl.c
index 14a2035..f3b2156 100644
--- a/src/psl.c
+++ b/src/psl.c
@@ -701,6 +701,17 @@ static int _psl_idna_toASCII(_psl_idna_t *idna _UNUSED, const char *utf8, char *
 			fprintf(stderr, "Failed to convert UTF-8 to UTF-16 (status %d)\n", status); */
 	}
 #elif defined(WITH_LIBIDN2)
+#if IDN2_VERSION_NUMBER >= 0x00140000
+	int rc;
+
+	/* IDN2_TRANSITIONAL automatically converts to lowercase */
+	/* IDN2_NFC_INPUT converts to NFC before toASCII conversion */
+
+	if ((rc = idn2_lookup_u8((uint8_t *)utf8, (uint8_t **)ascii, IDN2_NFC_INPUT | IDN2_TRANSITIONAL)) == IDN2_OK)
+		ret = 0;
+	/* else
+		fprintf(stderr, "toASCII(%s) failed (%d): %s\n", lower, rc, idn2_strerror(rc)); */
+#else
 	int rc;
 	uint8_t *lower;
 	size_t len = u8_strlen((uint8_t *)utf8) + 1;
@@ -717,6 +728,7 @@ static int _psl_idna_toASCII(_psl_idna_t *idna _UNUSED, const char *utf8, char *
 		fprintf(stderr, "toASCII(%s) failed (%d): %s\n", lower, rc, idn2_strerror(rc)); */
 
 	free(lower);
+#endif
 #elif defined(WITH_LIBIDN)
 	int rc;