diff --git a/lib/error/cast.js b/lib/error/cast.js
index f7df49b8c7e..115927117f7 100644
--- a/lib/error/cast.js
+++ b/lib/error/cast.js
@@ -75,7 +75,6 @@ class CastError extends MongooseError {
    * ignore
    */
   setModel(model) {
-    this.model = model;
     this.message = formatMessage(model, this.kind, this.value, this.path,
       this.messageFormat, this.valueType);
   }
diff --git a/types/error.d.ts b/types/error.d.ts
index 226fad31931..3fec7c41399 100644
--- a/types/error.d.ts
+++ b/types/error.d.ts
@@ -28,7 +28,6 @@ declare module 'mongoose' {
       value: any;
       path: string;
       reason?: NativeError | null;
-      model?: any;
 
       constructor(type: string, value: any, path: string, reason?: NativeError, schemaType?: SchemaType);
     }