diff --git a/gallery_dl/text.py b/gallery_dl/text.py
index a6a9105b..74b87fb7 100644
--- a/gallery_dl/text.py
+++ b/gallery_dl/text.py
@@ -67,7 +67,7 @@ def nameext_from_url(url, data=None):
 
     filename = unquote(filename_from_url(url))
     name, _, ext = filename.rpartition(".")
-    if name:
+    if name and len(ext) <= 16:
         data["filename"], data["extension"] = name, ext.lower()
     else:
         data["filename"], data["extension"] = filename, ""
diff --git a/test/test_text.py b/test/test_text.py
index 1daefde8..3ab9e73c 100644
--- a/test/test_text.py
+++ b/test/test_text.py
@@ -148,6 +148,10 @@ class TestText(unittest.TestCase):
         self.assertEqual(
             f("http://example.org/v2/filename.ext?param=value#frag"), result)
 
+        # long "extension"
+        fn = "httpswww.example.orgpath-path-path-path-path-path-path-path"
+        self.assertEqual(f(fn), {"filename": fn, "extension": ""})
+
         # invalid arguments
         for value in INVALID:
             self.assertEqual(f(value), empty)