diff --git a/libs/vkd3d-shader/ir.c b/libs/vkd3d-shader/ir.c
index 7ced3aeb..d4315166 100644
--- a/libs/vkd3d-shader/ir.c
+++ b/libs/vkd3d-shader/ir.c
@@ -8157,6 +8157,7 @@ static void vsir_validate_dst_param(struct validation_context *ctx,
 
         case VKD3DSPR_IMMCONST:
         case VKD3DSPR_IMMCONST64:
+        case VKD3DSPR_CONSTBUFFER:
         case VKD3DSPR_SAMPLER:
         case VKD3DSPR_RESOURCE:
             validator_error(ctx, VKD3D_SHADER_ERROR_VSIR_INVALID_REGISTER_TYPE,