diff --git a/src/gallium/drivers/llvmpipe/lp_setup.c b/src/gallium/drivers/llvmpipe/lp_setup.c
index 26081a4fac7..6682f20a9e8 100644
--- a/src/gallium/drivers/llvmpipe/lp_setup.c
+++ b/src/gallium/drivers/llvmpipe/lp_setup.c
@@ -410,6 +410,7 @@ lp_setup_bind_framebuffer(struct lp_setup_context *setup,
    setup->framebuffer.y0 = 0;
    setup->framebuffer.x1 = fb->width-1;
    setup->framebuffer.y1 = fb->height-1;
+   setup->viewport_index_slot = -1;
    setup->dirty |= LP_SETUP_NEW_SCISSOR;
 }