diff --git a/src/libspf2/spf_dns_resolv.c b/src/libspf2/spf_dns_resolv.c
index 10ccee6..7acdd1f 100644
--- a/src/libspf2/spf_dns_resolv.c
+++ b/src/libspf2/spf_dns_resolv.c
@@ -79,13 +79,13 @@ static const struct res_sym ns_sects[] = {
 static const int num_ns_sect = sizeof(ns_sects) / sizeof(*ns_sects);
 
 
-#if HAVE_DECL_RES_NINIT
+#if HAVE_DECL_RES_NINIT && !defined(__UCLIBC__)
 # define SPF_h_errno res_state->res_h_errno
 #else
 # define SPF_h_errno h_errno
 #endif
 
-#if HAVE_DECL_RES_NINIT
+#if HAVE_DECL_RES_NINIT && !defined(__UCLIBC__)
 static pthread_once_t	res_state_control = PTHREAD_ONCE_INIT;
 static pthread_key_t	res_state_key;
 
@@ -239,14 +239,14 @@ SPF_dns_resolv_lookup(SPF_dns_server_t *spf_dns_server,
 	size_t	rdlen;
 	const u_char	*rdata;
 
-#if HAVE_DECL_RES_NINIT
+#if HAVE_DECL_RES_NINIT && !defined(__UCLIBC__)
 	void				*res_spec;
 	struct __res_state	*res_state;
 #endif
 
 	SPF_ASSERT_NOTNULL(spf_dns_server);
 
-#if HAVE_DECL_RES_NINIT
+#if HAVE_DECL_RES_NINIT && !defined(__UCLIBC__)
 	/** Get the thread-local resolver state. */
 	res_spec = pthread_getspecific(res_state_key);
 	if (res_spec == NULL) {
@@ -292,7 +292,7 @@ SPF_dns_resolv_lookup(SPF_dns_server_t *spf_dns_server,
 	for (;;) {
 		int	dns_len;
 
-#if HAVE_DECL_RES_NINIT
+#if HAVE_DECL_RES_NINIT && !defined(__UCLIBC__)
 		/* Resolve the name. */
 		dns_len = res_nquery(res_state, domain, ns_c_in, rr_type,
 				 responsebuf, responselen);
@@ -606,7 +606,7 @@ SPF_dns_resolv_free(SPF_dns_server_t *spf_dns_server)
 {
 	SPF_ASSERT_NOTNULL(spf_dns_server);
 
-#if ! HAVE_DECL_RES_NINIT
+#if ! HAVE_DECL_RES_NINIT || defined(__UCLIBC__)
 	res_close();
 #endif
 
@@ -619,7 +619,7 @@ SPF_dns_resolv_new(SPF_dns_server_t *layer_below,
 {
 	SPF_dns_server_t		*spf_dns_server;
 
-#if HAVE_DECL_RES_NINIT
+#if HAVE_DECL_RES_NINIT && !defined(__UCLIBC__)
 	pthread_once(&res_state_control, SPF_dns_resolv_init_key);
 #else
 	if (res_init() != 0) {