diff --git a/src/package-managers/npm.ts b/src/package-managers/npm.ts
index 2fde0c50..6de6233c 100644
--- a/src/package-managers/npm.ts
+++ b/src/package-managers/npm.ts
@@ -298,7 +298,7 @@ export const mockViewMany =
       },
       version,
       // overwritten below
-      versions: [],
+      versions: {},
       ...(isPackument(partialPackument) ? partialPackument : null),
     }
 
@@ -315,7 +315,9 @@ export const mockViewMany =
               } as Index<string>)
             : ({
                 ...packument,
-                versions: [packument],
+                versions: {
+                  [version]: packument,
+                },
               } as Packument),
       })),
     )
diff --git a/src/types/Packument.ts b/src/types/Packument.ts
index 99bcea4a..f04d6064 100644
--- a/src/types/Packument.ts
+++ b/src/types/Packument.ts
@@ -3,6 +3,9 @@ import { Version } from './Version'
 
 /** A pacote packument result object. */
 export interface Packument {
+  _npmUser?: {
+    name: string
+  }
   name: string
   deprecated?: boolean
   engines: {
@@ -12,5 +15,5 @@ export interface Packument {
   // TODO: store only the time of the latest version?
   time?: Index<string>
   version: Version
-  versions: Packument[]
+  versions: Index<Packument>
 }