diff --git a/gui/src/app/tinystan/index.ts b/gui/src/app/tinystan/index.ts
index 2b4beb91..053ba895 100644
--- a/gui/src/app/tinystan/index.ts
+++ b/gui/src/app/tinystan/index.ts
@@ -61,9 +61,7 @@ export type StanDraws = {
   draws: number[][];
 };
 
-export type StanVariableInputs = {
-  [k: string]: unknown;
-};
+export type StanVariableInputs = Record<string, unknown>;
 
 export interface SamplerParams {
   data: string | StanVariableInputs;