diff --git a/src/resolver.h b/src/resolver.h
index 8d5cb187e..e5ad06754 100644
--- a/src/resolver.h
+++ b/src/resolver.h
@@ -42,6 +42,7 @@ resolver_quark(void)
  * @param error location to store the error occurring, or NULL to
  * ignore errors
  */
+G_GNUC_MALLOC
 char *
 sockaddr_to_string(const struct sockaddr *sa, size_t length, GError **error);