diff --git a/src/mesa/state_tracker/st_pbo_compute.c b/src/mesa/state_tracker/st_pbo_compute.c
index 542c9b628f4..14f100bd27a 100644
--- a/src/mesa/state_tracker/st_pbo_compute.c
+++ b/src/mesa/state_tracker/st_pbo_compute.c
@@ -624,7 +624,7 @@ create_conversion_shader(struct st_context *st, enum pipe_texture_target target,
 
    nir_ssa_def *coord = nir_channels(&b, start, (1<<coord_components)-1);
    nir_ssa_def *max = nir_iadd(&b, sd.offset, sd.range);
-   nir_push_if(&b, nir_ball(&b, nir_ilt(&b, coord, nir_channels(&b, max, (1<<coord_components)-1))));
+   nir_push_if(&b, nir_ball(&b, nir_ilt(&b, coord, nir_trim_vector(&b, max, coord_components))));
    nir_tex_instr *txf = nir_tex_instr_create(b.shader, 3);
    txf->is_array = glsl_sampler_type_is_array(sampler->type);
    txf->op = nir_texop_txf;