diff --git a/Tools/autotest/dump_logs.py b/Tools/autotest/dump_logs.py
old mode 100644
new mode 100755
diff --git a/Tools/autotest/pysim/util.py b/Tools/autotest/pysim/util.py
index 88443dd3fb..da5a07b5c6 100644
--- a/Tools/autotest/pysim/util.py
+++ b/Tools/autotest/pysim/util.py
@@ -122,7 +122,10 @@ def start_SIL(atype, valgrind=False, wipe=False, height=None):
     cmd=""
     if valgrind and os.path.exists('/usr/bin/valgrind'):
         cmd += 'valgrind -q --log-file=%s-valgrind.log ' % atype
-    cmd += reltopdir('tmp/%s.build/%s.elf' % (atype, atype))
+    executable = 'tmp/%s.build/%s.elf' % (atype, atype)
+    if not os.path.exists(executable):
+        executable = '/tmp/%s.build/%s.elf' % (atype, atype)
+    cmd += executable
     if wipe:
         cmd += ' -w'
     if height is not None: