diff --git a/core/src/com/unciv/models/metadata/GameSpeed.kt b/core/src/com/unciv/models/metadata/GameSpeed.kt
index c74ace1db8..692112d254 100644
--- a/core/src/com/unciv/models/metadata/GameSpeed.kt
+++ b/core/src/com/unciv/models/metadata/GameSpeed.kt
@@ -3,13 +3,15 @@ package com.unciv.models.metadata
 enum class GameSpeed{
     Quick,
     Standard,
-    Epic;
+    Epic,
+    Marathon;
 
     fun getModifier(): Float {
         when(this) {
             Quick -> return 0.67f
             Standard -> return 1f
             Epic -> return 1.5f
+            Marathon -> return 1.5f
         }
     }
 }
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