diff --git a/gio/tests/gdbus-introspection.c b/gio/tests/gdbus-introspection.c
index a93c776de..e7fab2b39 100644
--- a/gio/tests/gdbus-introspection.c
+++ b/gio/tests/gdbus-introspection.c
@@ -135,7 +135,7 @@ test_introspection_parser (void)
    */
   usleep (500 * 1000);
   /* this is safe; testserver will exit once the bus goes away */
-  g_assert (g_spawn_command_line_async ("./gdbus-testserver.py", NULL));
+  g_assert (g_spawn_command_line_async (SRCDIR "/gdbus-testserver.py", NULL));
 
   g_main_loop_run (loop);
 
diff --git a/gio/tests/gdbus-threading.c b/gio/tests/gdbus-threading.c
index 1de395c3b..3fe0f7bea 100644
--- a/gio/tests/gdbus-threading.c
+++ b/gio/tests/gdbus-threading.c
@@ -507,7 +507,7 @@ main (int   argc,
   usleep (500 * 1000);
 
   /* this is safe; testserver will exit once the bus goes away */
-  g_assert (g_spawn_command_line_async ("./gdbus-testserver.py", NULL));
+  g_assert (g_spawn_command_line_async (SRCDIR "/gdbus-testserver.py", NULL));
 
   /* wait for the service to come up */
   usleep (500 * 1000);