diff --git a/patoolib/util.py b/patoolib/util.py
index e25e3ce..48e8db9 100644
--- a/patoolib/util.py
+++ b/patoolib/util.py
@@ -359,14 +359,11 @@ def stripext (filename):
 def get_single_outfile (directory, archive, extension=""):
     """Get output filename if archive is in a single file format like gzip."""
     outfile = os.path.join(directory, stripext(archive))
-    if is_same_filename(archive, outfile):
-        # prevent overwriting the archive itself
-        extension = ".raw"
-    if os.path.exists(outfile+extension):
+    if os.path.exists(outfile + extension):
         # prevent overwriting existing files
         i = 1
         newfile = "%s%d" % (outfile, i)
-        while os.path.exists(newfile+extension):
+        while os.path.exists(newfile + extension):
             newfile = "%s%d" % (outfile, i)
             i += 1
         outfile = newfile