diff --git a/mozilla/toolkit/components/history/src/nsGlobalHistory.cpp b/mozilla/toolkit/components/history/src/nsGlobalHistory.cpp
index 9ff922d09bf..19b55d875b4 100644
--- a/mozilla/toolkit/components/history/src/nsGlobalHistory.cpp
+++ b/mozilla/toolkit/components/history/src/nsGlobalHistory.cpp
@@ -3916,7 +3916,7 @@ nsGlobalHistory::RowMatches(nsIMdbRow *aRow,
       PRInt32 yarnLength = yarn.mYarn_Fill;;
       nsCAutoString titleStr;
       if (property_column == kToken_NameColumn) {
-        titleStr =  NS_ConvertUCS2toUTF8((const PRUnichar*)yarn.mYarn_Buf, yarnLength);
+        titleStr =  NS_ConvertUCS2toUTF8((const PRUnichar*)yarn.mYarn_Buf, yarnLength / 2);
         startPtr = titleStr.get();
         yarnLength = titleStr.Length();
       }