diff --git a/src/server/services/round-engine.ts b/src/server/services/round-engine.ts
index 9fc75de..0bf2798 100644
--- a/src/server/services/round-engine.ts
+++ b/src/server/services/round-engine.ts
@@ -462,10 +462,11 @@ export async function reopenRound(
         }
       }
 
-      // Reopen this round
+      // Reopen this round — clear windowCloseAt so the voting window check
+      // doesn't reject submissions with "Voting window has closed".
       const updated = await tx.round.update({
         where: { id: roundId },
-        data: { status: 'ROUND_ACTIVE' },
+        data: { status: 'ROUND_ACTIVE', windowCloseAt: null },
       })
 
       await tx.decisionAuditLog.create({