diff --git a/src/microsoft/compiler/nir_to_dxil.c b/src/microsoft/compiler/nir_to_dxil.c
index 10f733ee7ea..10558071bb4 100644
--- a/src/microsoft/compiler/nir_to_dxil.c
+++ b/src/microsoft/compiler/nir_to_dxil.c
@@ -5757,6 +5757,7 @@ nir_to_dxil(struct nir_shader *s, const struct nir_to_dxil_options *opts,
    NIR_PASS_V(s, dxil_nir_ensure_position_writes);
    NIR_PASS_V(s, nir_lower_pack);
    NIR_PASS_V(s, dxil_nir_lower_system_values);
+   NIR_PASS_V(s, nir_lower_io_to_scalar, nir_var_shader_in | nir_var_system_value | nir_var_shader_out);
 
    if (ctx->mod.shader_kind == DXIL_HULL_SHADER)
       NIR_PASS_V(s, dxil_nir_split_tess_ctrl, &ctx->tess_ctrl_patch_constant_func);