diff --git a/mozilla/xpcom/io/nsLocalFileUnix.cpp b/mozilla/xpcom/io/nsLocalFileUnix.cpp
index c7f0edee215..189897d551f 100644
--- a/mozilla/xpcom/io/nsLocalFileUnix.cpp
+++ b/mozilla/xpcom/io/nsLocalFileUnix.cpp
@@ -826,8 +826,11 @@ nsLocalFile::GetFileSize(PRInt64 *aFileSize)
     NS_ENSURE_ARG_POINTER(aFileSize);
     VALIDATE_STAT_CACHE();
     
-    /* XXX autoconf for and use stat64 if available */
-    mLL_II2L(0, (PRUint32)mCachedStat.st_size, *aFileSize);
+	/* XXX autoconf for and use stat64 if available */
+    if( S_ISDIR(mCachedStat.st_mode) )
+		mLL_II2L(0, (PRUint32)0, *aFileSize);
+    else	
+		mLL_II2L(0, (PRUint32)mCachedStat.st_size, *aFileSize);
     return NS_OK;
 }