diff --git a/packages/next/build/webpack/plugins/build-stats-plugin.ts b/packages/next/build/webpack/plugins/build-stats-plugin.ts
index 83f2945b6cb6a..f3ab340f4c62a 100644
--- a/packages/next/build/webpack/plugins/build-stats-plugin.ts
+++ b/packages/next/build/webpack/plugins/build-stats-plugin.ts
@@ -39,7 +39,9 @@ function reduceSize(stats: any) {
             reducedModule.reasons = []
           }
 
-          reducedModule.reasons.push(reason.id)
+          reducedModule.reasons.push({
+            id: reason.id,
+          })
         }
       }
       // Identifier is part of the Map