--- a/libs/filesystem/v2/src/v2_operations.cpp	2010-08-10 13:00:09.000000000 -0700
+++ b/libs/filesystem/v2/src/v2_operations.cpp	2011-06-16 17:28:00.000000000 -0700
@@ -1215,8 +1214,9 @@
         if ( ::stat( from_file_ph.c_str(), &from_stat ) != 0 )
           { return error_code( errno, system_category() ); }
 
-        int oflag = O_CREAT | O_WRONLY;
-        if ( fail_if_exists ) oflag |= O_EXCL;
+        int oflag = O_CREAT | O_WRONLY | O_TRUNC;
+        if ( fail_if_exists )
+          oflag |= O_EXCL;
         if (  (outfile = ::open( to_file_ph.c_str(), oflag, from_stat.st_mode )) < 0 )
         {
           int open_errno = errno;
--- a/libs/filesystem/v3/src/operations.cpp	2010-10-16 06:09:25.000000000 -0700
+++ b/libs/filesystem/v3/src/operations.cpp	2011-06-16 17:28:00.000000000 -0700
@@ -426,8 +433,9 @@
     if (::stat(from_p.c_str(), &from_stat)!= 0)
       { return false; }
 
-    int oflag = O_CREAT | O_WRONLY;
-    if (fail_if_exists)oflag |= O_EXCL;
+    int oflag = O_CREAT | O_WRONLY | O_TRUNC;
+    if (fail_if_exists)
+      oflag |= O_EXCL;
     if ((outfile = ::open(to_p.c_str(), oflag, from_stat.st_mode))< 0)
     {
       int open_errno = errno;