diff --git a/test/embed.c b/test/embed.c
index 2d268cab..e4372980 100644
--- a/test/embed.c
+++ b/test/embed.c
@@ -148,7 +148,7 @@ static const struct test_config {
 
 static void *callback(enum mg_event event,
                       struct mg_connection *conn,
-                      struct mg_request_info *request_info) {
+                      const struct mg_request_info *request_info) {
   int i;
 
   for (i = 0; test_config[i].uri != NULL; i++) {