diff --git a/cmake/FindWrapResolv.cmake b/cmake/FindWrapResolv.cmake
index 159df9b..412a2ae 100644
--- a/cmake/FindWrapResolv.cmake
+++ b/cmake/FindWrapResolv.cmake
@@ -40,7 +40,7 @@ check_cxx_source_compiles("
 
 int main(int, char **argv)
 {
-    res_state statep = {};
+    res_state statep = nullptr;
     int n = res_nmkquery(statep, 0, argv[1], 0, 0, NULL, 0, NULL, NULL, 0);
     n = res_nsend(statep, NULL, 0, NULL, 0);
     n = dn_expand(NULL, NULL, NULL, NULL, 0);