diff --git a/libs/vkd3d-shader/ir.c b/libs/vkd3d-shader/ir.c
index 49f4064a..a91b9d19 100644
--- a/libs/vkd3d-shader/ir.c
+++ b/libs/vkd3d-shader/ir.c
@@ -7827,9 +7827,7 @@ static void vsir_validate_constbuffer_register(struct validation_context *ctx,
         return;
     }
 
-    if (reg->idx[0].rel_addr)
-        validator_error(ctx, VKD3D_SHADER_ERROR_VSIR_INVALID_INDEX,
-                "Non-NULL relative address for a CONSTBUFFER register ID.");
+    vsir_validate_descriptor_indices(ctx, reg, VKD3D_SHADER_DESCRIPTOR_TYPE_CBV, "cb");
 }
 
 static void vsir_validate_sampler_register(struct validation_context *ctx,