diff --git a/src/gallium/drivers/llvmpipe/lp_setup_tri.c b/src/gallium/drivers/llvmpipe/lp_setup_tri.c
index 45553da0e38..97384962664 100644
--- a/src/gallium/drivers/llvmpipe/lp_setup_tri.c
+++ b/src/gallium/drivers/llvmpipe/lp_setup_tri.c
@@ -394,7 +394,8 @@ do_triangle_ccw(struct lp_setup_context *setup,
        setup->pixel_offset == 0.5f &&
        key->num_inputs == 1 &&
        (key->inputs[0].interp == LP_INTERP_LINEAR ||
-        key->inputs[0].interp == LP_INTERP_PERSPECTIVE)) {
+        key->inputs[0].interp == LP_INTERP_PERSPECTIVE) &&
+        setup->fs.current_tex_num == 0) {
       float dist0 = v0[0][0] * v0[0][0] + v0[0][1] * v0[0][1];
       float dist1 = v1[0][0] * v1[0][0] + v1[0][1] * v1[0][1];
       float dist2 = v2[0][0] * v2[0][0] + v2[0][1] * v2[0][1];