diff --git a/postlicyd/dns.c b/postlicyd/dns.c
index d8409c2..97f1c4d 100644
--- a/postlicyd/dns.c
+++ b/postlicyd/dns.c
@@ -123,7 +123,7 @@ static int dns_handler(client_t *event, void *config)
 }
 
 bool dns_resolve(const char *hostname, dns_rrtype_t type,
-                 ub_callback_t callback, void *data)
+                 ub_callback_type callback, void *data)
 {
     if (_G.ctx == NULL) {
         _G.ctx = ub_ctx_create();
diff --git a/postlicyd/dns.h b/postlicyd/dns.h
index d84de3b..905b924 100644
--- a/postlicyd/dns.h
+++ b/postlicyd/dns.h
@@ -89,7 +89,7 @@ typedef void (*dns_result_callback_f)(dns_result_t *result, void *data);
  */
 __attribute__((nonnull(1,3,4)))
 bool dns_resolve(const char *hostname, dns_rrtype_t type,
-                 ub_callback_t callback, void *data);
+                 ub_callback_type callback, void *data);
 
 /** Fetch the DNS record of the given type.
  */
diff --git a/postlicyd/spf-proto.c b/postlicyd/spf-proto.c
index 31cb0a5..79a2d83 100644
--- a/postlicyd/spf-proto.c
+++ b/postlicyd/spf-proto.c
@@ -279,7 +279,7 @@ static bool spf_validate_domain(const char* restrict domain)
 }
 
 static bool spf_query(spf_t *spf, const char* query, dns_rrtype_t rtype,
-                      ub_callback_t cb)
+                      ub_callback_type cb)
 {
     buffer_reset(&_G.query_buffer);
     buffer_addstr(&_G.query_buffer, query);