diff --git a/indra/newview/viewer_manifest.py b/indra/newview/viewer_manifest.py
index 024f2f655cf3244a23d6df7d38219fb48c7d38f6..99c9abfddf506b9e28e814aae4ae7f37a45e95f7 100755
--- a/indra/newview/viewer_manifest.py
+++ b/indra/newview/viewer_manifest.py
@@ -404,7 +404,7 @@ def package_finish(self):
         if not python or python == "${PYTHON}":
             python = 'python'
         if os.path.exists(sign_py):
-            self.run_command("%s %s %s" % (python, sign_py, self.dst_path_of(installer_file)))
+            self.run_command("%s %s %s" % (python, sign_py, self.dst_path_of(installer_file).replace('\\', '\\\\')))
         else:
             print "Skipping code signing,", sign_py, "does not exist"
         self.created_path(self.dst_path_of(installer_file))