diff --git a/tests/fbo/fbo-depth.c b/tests/fbo/fbo-depth.c
index 6496514..21c3ba0 100644
--- a/tests/fbo/fbo-depth.c
+++ b/tests/fbo/fbo-depth.c
@@ -88,10 +88,12 @@ static enum piglit_result test_clear(void)
        glClear(GL_DEPTH_BUFFER_BIT);

        glEnable(GL_DEPTH_TEST);
-       glDepthFunc(GL_EQUAL);

        glColor3fv(green);
-       piglit_draw_rect_z(0.5, -1, -1, 2, 2); /* 0.75 converted to clip space is 0.5. */
+       glDepthFunc(GL_LEQUAL);
+       piglit_draw_rect_z(0.499, -1, -1, 1, 2); /* 0.75 converted to clip space is 0.5. *
+       glDepthFunc(GL_GEQUAL);
+       piglit_draw_rect_z(0.501, 0, -1, 1, 2);
        glColor3f(1, 1, 1);

        glDisable(GL_DEPTH_TEST);