diff --git a/src/gallium/drivers/radeonsi/si_state_shaders.c b/src/gallium/drivers/radeonsi/si_state_shaders.c
index e40fe5d67fc..8ea69056240 100644
--- a/src/gallium/drivers/radeonsi/si_state_shaders.c
+++ b/src/gallium/drivers/radeonsi/si_state_shaders.c
@@ -78,11 +78,11 @@ void si_get_ir_cache_key(struct si_shader_selector *sel, bool ngg, bool es,
        sel->info.base.fs.uses_discard &&
        sel->screen->debug_flags & DBG(FS_CORRECT_DERIVS_AFTER_KILL))
       shader_variant_flags |= 1 << 3;
-
-   /* This varies depending on whether compute-based culling is enabled. */
-   assert(sel->screen->num_vbos_in_user_sgprs <= 7);
-   shader_variant_flags |= MIN2(sel->screen->num_vbos_in_user_sgprs, 7) << 4;
-
+   if (sel->info.stage == MESA_SHADER_VERTEX) {
+      /* This varies depending on whether compute-based culling is enabled. */
+      assert(sel->screen->num_vbos_in_user_sgprs <= 7);
+      shader_variant_flags |= MIN2(sel->screen->num_vbos_in_user_sgprs, 7) << 4;
+   }
    if (sel->screen->options.no_infinite_interp)
       shader_variant_flags |= 1 << 7;
    if (sel->screen->options.clamp_div_by_zero)