diff --git a/libs/vkd3d-shader/hlsl_codegen.c b/libs/vkd3d-shader/hlsl_codegen.c
index 30ce7cec3..19cd47f9f 100644
--- a/libs/vkd3d-shader/hlsl_codegen.c
+++ b/libs/vkd3d-shader/hlsl_codegen.c
@@ -7754,6 +7754,10 @@ bool hlsl_regset_index_from_deref(struct hlsl_ctx *ctx, const struct hlsl_deref
                     *index += 4 * idx;
                     break;
 
+                case HLSL_CLASS_VECTOR:
+                    *index += idx;
+                    break;
+
                 default:
                     vkd3d_unreachable();
             }