diff --git a/tests/fsfocus.c b/tests/fsfocus.c
index 5107559..e718a31 100644
--- a/tests/fsfocus.c
+++ b/tests/fsfocus.c
@@ -101,7 +101,7 @@
     while (running)
     {
         glClear(GL_COLOR_BUFFER_BIT);
-        glfwSwapBuffers();
+        glfwSwapBuffers(window);
         glfwWaitEvents();
     }