diff --git a/src/mol-plugin/context.ts b/src/mol-plugin/context.ts
index f79d6ec5903857132bd4675e35e232a4338f8ae5..7b0557bb29fbe7c5e069602821f5ea45ff5abb73 100644
--- a/src/mol-plugin/context.ts
+++ b/src/mol-plugin/context.ts
@@ -137,7 +137,7 @@ export class PluginContext {
      * Used to store application specific custom state which is then available
      * to State Actions and similar constructs via the PluginContext.
      */
-    readonly customState: any = Object.create(null);
+    readonly customState: unknown = Object.create(null);
 
     initViewer(canvas: HTMLCanvasElement, container: HTMLDivElement) {
         try {