diff --git a/src/saveload/gamelog_sl.cpp b/src/saveload/gamelog_sl.cpp
--- a/src/saveload/gamelog_sl.cpp
+++ b/src/saveload/gamelog_sl.cpp
@@ -344,7 +344,8 @@ public:
 
 static const SaveLoad _gamelog_desc[] = {
 	SLE_CONDVAR(LoggedAction, at,            SLE_UINT8,   SLV_RIFF_TO_ARRAY, SL_MAX_VERSION),
-	SLE_VAR(LoggedAction, tick,              SLE_UINT16),
+	SLE_CONDVAR(LoggedAction, tick, SLE_FILE_U16 | SLE_VAR_U64, SL_MIN_VERSION, SLV_U64_TICK_COUNTER),
+	SLE_CONDVAR(LoggedAction, tick, SLE_UINT64,                 SLV_U64_TICK_COUNTER, SL_MAX_VERSION),
 	SLEG_STRUCTLIST("action", SlGamelogAction),
 };