diff --git a/checkin_notes b/checkin_notes
index 679c05221c..d7ab5748d6 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -6002,3 +6002,9 @@ David  28 July 2008
     html/ops/
         repair_forums.php
         db_update.php
+
+Eric  28 July 2008
+    - modified the credit multiplier calculation to make it more stable.
+
+    tools/
+        calculate_credit_multiplier
diff --git a/tools/calculate_credit_multiplier b/tools/calculate_credit_multiplier
index 031e77f601..9cd3a758da 100755
--- a/tools/calculate_credit_multiplier
+++ b/tools/calculate_credit_multiplier
@@ -88,7 +88,7 @@ for appid in $appids ; do
     last_value=`$MYSQL --execute="select multiplier from credit_multiplier where appid=$appid and (unix_timestamp(now())-time)=(select min(unix_timestamp(now())-time) from credit_multiplier where appid=$appid)"`
     last_time=`$MYSQL --execute="select unix_timestamp(now())-time from credit_multiplier where appid=$appid and (unix_timestamp(now())-time)=(select min(unix_timestamp(now())-time) from credit_multiplier where appid=$appid)"`
 
-    value=`$MYSQL --execute="select ($last_value*(($DECAY_TIME)-$last_time)+$ratio*$last_time)/($DECAY_TIME)"`
+    value=`$MYSQL --execute="select ($last_value*((($DECAY_TIME)-$last_time)+$ratio*$last_time))/($DECAY_TIME)"`
 
     $MYSQL --execute="insert into credit_multiplier values (0,$appid,unix_timestamp(now()),$value);"
 done