diff --git a/scripts/size.ts b/scripts/size.ts
index f9da8052d..1c486197b 100644
--- a/scripts/size.ts
+++ b/scripts/size.ts
@@ -22,10 +22,10 @@ const readStats = async (path: string): Promise<Record<string, number>> => {
 };
 
 const formatBytes = (bytes: number): string => {
-  bytes = Math.abs(bytes);
   if (bytes == 0) {
     return '0 Bytes';
   }
+  bytes = Math.abs(bytes);
   const base = 1024;
   const decimals = 2;
   const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];