diff --git a/src/core/configuration/DefaultConfig.ts b/src/core/configuration/DefaultConfig.ts
index 07e815374..972ab469c 100644
--- a/src/core/configuration/DefaultConfig.ts
+++ b/src/core/configuration/DefaultConfig.ts
@@ -520,7 +520,7 @@ export class DefaultConfig implements Config {
     return 30 * 10;
   }
   allianceDuration(): Tick {
-    return 600 * 10; // 10 minutes.
+    return 300 * 10; // 5 minutes.
   }
   temporaryEmbargoDuration(): Tick {
     return 300 * 10; // 5 minutes.