diff --git a/src/util.ts b/src/util.ts
index 78518a7084..0fe12b4bde 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -216,7 +216,7 @@ export function errnoMessage(errno: number | undefined): string {
   )
 }
 
-export type Duration = number  | `${number}m` | `${number}s` | `${number}ms`
+export type Duration = number | `${number}m` | `${number}s` | `${number}ms`
 
 export function parseDuration(d: Duration) {
   if (typeof d == 'number') {