diff -r e10eacec8b91 tools/xentrace/xentrace.c
--- a/tools/xentrace/xentrace.c	Wed Nov 28 22:36:33 2007 +0000
+++ b/tools/xentrace/xentrace.c	Thu Nov 29 13:28:10 2007 +0100
@@ -581,7 +581,9 @@ int main(int argc, char **argv)
     }
 
     if ( opts.outfile )
-        outfd = open(opts.outfile, O_WRONLY | O_CREAT | O_LARGEFILE, 0644);
+        outfd = open(opts.outfile,
+			O_WRONLY | O_CREAT | O_TRUNC | O_LARGEFILE,
+			0644);
 
     if(outfd < 0)
     {