diff --git a/src/mesa/state_tracker/st_cb_fbo.c b/src/mesa/state_tracker/st_cb_fbo.c
index 69dde56e557..2d741d93908 100644
--- a/src/mesa/state_tracker/st_cb_fbo.c
+++ b/src/mesa/state_tracker/st_cb_fbo.c
@@ -370,6 +370,8 @@ st_render_texture(GLcontext *ctx,
                                            att->TextureLevel,
                                            att->Zoffset);
    assert(strb->surface);
+   assert(screen->is_format_supported(screen, strb->surface->format, PIPE_TEXTURE));
+   assert(screen->is_format_supported(screen, strb->surface->format, PIPE_SURFACE));
 
    init_renderbuffer_bits(strb, pt->format);