diff --git a/gallery_dl/extractor/imagehosts.py b/gallery_dl/extractor/imagehosts.py
index f14d02ce..25eeed67 100644
--- a/gallery_dl/extractor/imagehosts.py
+++ b/gallery_dl/extractor/imagehosts.py
@@ -58,8 +58,16 @@ class ImagehostImageExtractor(Extractor):
         url, filename = self.get_info(page)
         if not url:
             return
-        data = text.nameext_from_url(filename, {"token": self.token})
+
+        if filename:
+            data = text.nameext_from_name(filename)
+            if not data["extension"]:
+                data["extension"] = text.ext_from_url(url)
+        else:
+            data = text.nameext_from_url(url)
+        data["token"] = self.token
         data.update(self.metadata(page))
+
         if self._https and url.startswith("http:"):
             url = "https:" + url[5:]
         if self._validate is not None:
@@ -341,7 +349,7 @@ class TurboimagehostImageExtractor(ImagehostImageExtractor):
 
     def get_info(self, page):
         url = text.extract(page, 'src="', '"', page.index("<img "))[0]
-        return url, url
+        return url, None
 
 
 class TurboimagehostGalleryExtractor(ImagehostImageExtractor):
@@ -380,7 +388,7 @@ class ViprImageExtractor(ImagehostImageExtractor):
 
     def get_info(self, page):
         url = text.extr(page, '<img src="', '"')
-        return url, url
+        return url, None
 
 
 class ImgclickImageExtractor(ImagehostImageExtractor):
diff --git a/test/results/postimg.py b/test/results/postimg.py
index e5b24496..c1857bee 100644
--- a/test/results/postimg.py
+++ b/test/results/postimg.py
@@ -32,10 +32,9 @@ __tests__ = (
     "#category": ("imagehost", "postimg", "image"),
     "#class"   : imagehosts.PostimgImageExtractor,
     "#results"      : "https://i.postimg.cc/PhJZt1Rw/test-tesuto.png?dl=1",
-    "#sha1_metadata": "2d05808d04e4e83e33200db83521af06e3147a84",
     "#sha1_content" : "cfaa8def53ed1a575e0c665c9d6d8cf2aac7a0ee",
 
-    "extension": "",
+    "extension": "png",
     "filename" : "test-テスト-\"&>",
     "token"    : "Wtn2b3hC",
 },