diff --git a/libs/vkd3d-shader/ir.c b/libs/vkd3d-shader/ir.c
index e07fcece..00500554 100644
--- a/libs/vkd3d-shader/ir.c
+++ b/libs/vkd3d-shader/ir.c
@@ -6443,6 +6443,13 @@ static void vsir_validate_src_param(struct validation_context *ctx,
                         "Invalid OUTPUT register used as source parameter.");
             break;
 
+        case VKD3DSPR_PATCHCONST:
+            if (ctx->program->shader_version.type != VKD3D_SHADER_TYPE_DOMAIN
+                    && ctx->program->shader_version.type != VKD3D_SHADER_TYPE_HULL)
+                validator_error(ctx, VKD3D_SHADER_ERROR_VSIR_INVALID_REGISTER_TYPE,
+                        "PATCHCONST register used as source parameters are only allowed in Hull and Domain Shaders.");
+            break;
+
         default:
             break;
     }