diff --git a/aio/content/examples/pipes/src/app/exponential-strength.pipe.ts b/aio/content/examples/pipes/src/app/exponential-strength.pipe.ts
index d277483853..de8a8fca2d 100644
--- a/aio/content/examples/pipes/src/app/exponential-strength.pipe.ts
+++ b/aio/content/examples/pipes/src/app/exponential-strength.pipe.ts
@@ -11,8 +11,7 @@ import { Pipe, PipeTransform } from '@angular/core';
 */
 @Pipe({name: 'exponentialStrength'})
 export class ExponentialStrengthPipe implements PipeTransform {
-  transform(value: number, exponent: string): number {
-    let exp = parseFloat(exponent);
-    return Math.pow(value, isNaN(exp) ? 1 : exp);
+  transform(value: number, exponent?: number): number {
+    return Math.pow(value, isNaN(exponent) ? 1 : exponent);
   }
 }