diff --git a/src/mesa/main/texenvprogram.c b/src/mesa/main/texenvprogram.c
index 6aa89d1..f5d1198 100644
--- a/src/mesa/main/texenvprogram.c
+++ b/src/mesa/main/texenvprogram.c
@@ -1208,6 +1208,7 @@ emit_texenv(struct texenv_fragment_program *p, GLuint unit)
    if (key->separate_specular ||
        unit != p->last_tex_stage ||
        alpha_shift ||
+       key->num_draw_buffers != 1 ||
        rgb_shift)
       dest = get_temp( p );
    else