diff --git a/img2dataset/reader.py b/img2dataset/reader.py
index 3fd491a..2c17c3b 100644
--- a/img2dataset/reader.py
+++ b/img2dataset/reader.py
@@ -57,7 +57,7 @@ def __init__(
         self.tmp_path = tmp_path
 
         if fs.isdir(url_path):
-            self.input_files = sorted(fs.glob(url_path + "/*." + input_format))
+            self.input_files = sorted(fs.glob(url_path.rstrip("/") + "/*." + input_format))
             if len(self.input_files) == 0:
                 raise ValueError(f"No file found at path {url_path} with extension {input_format}")
         else: