diff --git a/libs/vkd3d-shader/tpf.c b/libs/vkd3d-shader/tpf.c
index 92d3997a..10456f0e 100644
--- a/libs/vkd3d-shader/tpf.c
+++ b/libs/vkd3d-shader/tpf.c
@@ -4918,7 +4918,7 @@ static void write_sm4_dcl_semantic(const struct tpf_compiler *tpf, const struct
     {
         VKD3D_ASSERT(semantic != VKD3D_SHADER_SV_NONE);
         instr.idx_count = 1;
-        instr.idx[0] = semantic;
+        instr.idx[0] = vkd3d_siv_from_sysval_indexed(semantic, var->semantic.index);
     }
 
     write_sm4_instruction(tpf, &instr);