diff --git a/app/upgrades/v400/upgrade.go b/app/upgrades/v400/upgrade.go
index dc0adbe5c4..7afa01c2e9 100644
--- a/app/upgrades/v400/upgrade.go
+++ b/app/upgrades/v400/upgrade.go
@@ -52,9 +52,17 @@ func (u *Upgrade) Handler() upgradetypes.UpgradeHandler {
 func (u *Upgrade) StoreUpgrades() *storetypes.StoreUpgrades {
 	return &storetypes.StoreUpgrades{
 		Added: []string{
-			poststypes.StoreKey,
 			reportstypes.StoreKey,
 			reactionstypes.StoreKey,
 		},
+
+		// The posts key is here because it was already registered (due to an error) inside v2.3.1
+		// https://github.com/desmos-labs/desmos/blob/v2.3.1/app/app.go#L270
+		Renamed: []storetypes.StoreRename{
+			{
+				OldKey: "posts",
+				NewKey: poststypes.StoreKey,
+			},
+		},
 	}
 }