diff --git a/Lib/lib2to3/main.py b/Lib/lib2to3/main.py
index 1a1df01..d6b7088 100644
--- a/Lib/lib2to3/main.py
+++ b/Lib/lib2to3/main.py
@@ -80,7 +80,7 @@
             filename += self._append_suffix
         if orig_filename != filename:
             output_dir = os.path.dirname(filename)
-            if not os.path.isdir(output_dir):
+            if not os.path.isdir(output_dir) and output_dir:
                 os.makedirs(output_dir)
             self.log_message('Writing converted %s to %s.', orig_filename,
                              filename)
diff --git a/Misc/NEWS.d/next/Tools-Demos/2017-09-26-10-11-21.bpo-31583.TM90_H.rst b/Misc/NEWS.d/next/Tools-Demos/2017-09-26-10-11-21.bpo-31583.TM90_H.rst
new file mode 100644
index 0000000..472f61c
--- /dev/null
+++ b/Misc/NEWS.d/next/Tools-Demos/2017-09-26-10-11-21.bpo-31583.TM90_H.rst
@@ -0,0 +1,2 @@
+Fix 2to3 for using with --add-suffix option but without --output-dir
+option for relative path to files in current directory.