diff --git a/mozilla/editor/libeditor/html/nsHTMLDataTransfer.cpp b/mozilla/editor/libeditor/html/nsHTMLDataTransfer.cpp
index a40f412510a..16bd4491427 100644
--- a/mozilla/editor/libeditor/html/nsHTMLDataTransfer.cpp
+++ b/mozilla/editor/libeditor/html/nsHTMLDataTransfer.cpp
@@ -2179,7 +2179,7 @@ nsHTMLEditor::InsertAsPlaintextQuotation(const nsAString & aQuotedText,
 
   // The quotesPreformatted pref is a temporary measure. See bug 69638.
   // Eventually we'll pick one way or the other.
-  PRBool quotesInPre;
+  PRBool quotesInPre = PR_FALSE;
   nsCOMPtr<nsIPrefBranch> prefBranch =
     do_GetService(NS_PREFSERVICE_CONTRACTID, &rv);
   if (NS_SUCCEEDED(rv) && prefBranch)