diff --git a/docs/rh-log.txt b/docs/rh-log.txt
index a5a3ff96f3..1e6b1e8838 100644
--- a/docs/rh-log.txt
+++ b/docs/rh-log.txt
@@ -1,3 +1,7 @@
+October 9, 2009  (Changes by Graf Zahl)
+- fixed: AAmbientSound::Serialize was adjusting its timer value for savegames
+  even when it was set to a 'don't check' value.
+
 October 8, 2009
 - Reinstated the off-by-one check in D3DFB from r399. I thought I could get by
   at just fixing it at a specific value, since the supply of SM14 cards isn't
diff --git a/src/s_advsound.cpp b/src/s_advsound.cpp
index 31d2d94f2b..11c541f45c 100644
--- a/src/s_advsound.cpp
+++ b/src/s_advsound.cpp
@@ -1917,11 +1917,34 @@ void AAmbientSound::Serialize (FArchive &arc)
 	Super::Serialize (arc);
 	arc << bActive;
 	
-	int checktime = NextCheck - gametic;
-	arc << checktime;
-	if (arc.IsLoading ())
+	if (SaveVersion < 1902)
 	{
-		NextCheck = checktime + gametic;
+		arc << NextCheck;
+		NextCheck += gametic;
+		if (NextCheck < 0) NextCheck = INT_MAX;
+	}
+	else
+	{
+		if (arc.IsStoring())
+		{
+			if (NextCheck != INT_MAX)
+			{
+				int checktime = NextCheck - gametic;
+				arc << checktime;
+			}
+			else
+			{
+				arc << NextCheck;
+			}
+		}
+		else
+		{
+			arc << NextCheck;
+			if (checktime != INT_MAX)
+			{
+				NextCheck += gametic;
+			}
+		}
 	}
 }