diff --git a/src/error-with-context.ts b/src/error-with-context.ts
index 4df17f6..956ef37 100644
--- a/src/error-with-context.ts
+++ b/src/error-with-context.ts
@@ -8,7 +8,7 @@ export class ErrorWithContext extends Error {
         error.message += ` - ${extraContext}`;
       } else {
         if (error == null) {
-          error = (extraContext as any) as string;
+          error = extraContext as any as string;
         } else {
           error += ` - ${extraContext}`;
         }