diff --git a/pywb/warc/cdxindexer.py b/pywb/warc/cdxindexer.py
index 83ffef8d..58bc43a7 100644
--- a/pywb/warc/cdxindexer.py
+++ b/pywb/warc/cdxindexer.py
@@ -98,6 +98,7 @@ def iter_file_or_dir(inputs, recursive=True):
                     if filename.endswith(ALLOWED_EXT):
                         full_path = os.path.join(root, filename)
                         rel_path = os.path.relpath(full_path, input_)
+                        rel_path = rel_path.replace(os.path.sep, '/')
                         yield full_path, rel_path
 
 
diff --git a/pywb/warc/pathresolvers.py b/pywb/warc/pathresolvers.py
index 6e710533..1d7bf71b 100644
--- a/pywb/warc/pathresolvers.py
+++ b/pywb/warc/pathresolvers.py
@@ -28,6 +28,8 @@ class PrefixResolver:
         self.contains = contains if contains else ''
 
     def __call__(self, filename):
+        # use os path seperator
+        filename = filename.replace('/', os.path.sep)
         return [self.prefix + filename] if (self.contains in filename) else []
 
     def __repr__(self):
diff --git a/pywb/warc/test/test_indexing.py b/pywb/warc/test/test_indexing.py
index 7e185a8c..e64595a3 100644
--- a/pywb/warc/test/test_indexing.py
+++ b/pywb/warc/test/test_indexing.py
@@ -116,6 +116,12 @@ com,example)/ 20130729195151 http://test@example.com/ warc/revisit - B2LTWWPUOYA
 org,iana,example)/ 20130702195402 http://example.iana.org/ text/html 200 B2LTWWPUOYAH7UIPQ7ZUPQ4VMBSVC36A - - 1001 353 example-url-agnostic-orig.warc.gz
 Total: 206
 
+# test sort, multiple inputs, recursive, from base test dir
+>>> cli_lines(['--sort', '-r', '-',  get_test_dir()])
+com,example)/ 20130729195151 http://test@example.com/ warc/revisit - B2LTWWPUOYAH7UIPQ7ZUPQ4VMBSVC36A - - 591 355 warcs/example-url-agnostic-revisit.warc.gz
+org,iana,example)/ 20130702195402 http://example.iana.org/ text/html 200 B2LTWWPUOYAH7UIPQ7ZUPQ4VMBSVC36A - - 1001 353 warcs/example-url-agnostic-orig.warc.gz
+Total: 206
+
 # test sort, multiple inputs, all records + post query
 >>> cli_lines(['--sort', '-a', '-p', '-9', TEST_WARC_DIR])
 com,example)/ 20130729195151 http://test@example.com/ warc/revisit - B2LTWWPUOYAH7UIPQ7ZUPQ4VMBSVC36A - 355 example-url-agnostic-revisit.warc.gz