diff --git a/contrib/libarchive/libarchive/archive_hmac.c b/contrib/libarchive/libarchive/archive_hmac.c
--- a/contrib/libarchive/libarchive/archive_hmac.c
+++ b/contrib/libarchive/libarchive/archive_hmac.c
@@ -238,7 +238,7 @@
 	if (*ctx == NULL)
 		return -1;
 	EVP_MAC_free(mac);
-	params[0] = OSSL_PARAM_construct_utf8_string("digest", "SHA1", 0);
+	params[0] = OSSL_PARAM_construct_utf8_string("digest", (char *)"SHA1", 0);
 	params[1] = OSSL_PARAM_construct_end();
 	EVP_MAC_init(*ctx, key, key_len, params);
 #else
diff --git a/lib/libarchive/Makefile.inc b/lib/libarchive/Makefile.inc
--- a/lib/libarchive/Makefile.inc
+++ b/lib/libarchive/Makefile.inc
@@ -12,6 +12,7 @@
 CFLAGS+=	-DWITH_OPENSSL
 CFLAGS+=	-DOPENSSL_API_COMPAT=0x10100000L
 LIBADD+=	crypto
+CFLAGS.archive_hmac.c+=-Wno-error=cast-qual
 .else
 LIBADD+=	md
 .endif