diff --git a/linkcheck/checker/fileurl.py b/linkcheck/checker/fileurl.py
index 59820060..d27b6d4a 100644
--- a/linkcheck/checker/fileurl.py
+++ b/linkcheck/checker/fileurl.py
@@ -122,6 +122,14 @@ class FileUrl(urlbase.UrlBase):
         )
         self.scheme = 'file'
 
+    def reset(self):
+        super().reset()
+        # the local file URI
+        self.url_without_anchor = None
+        # including the anchor in self.url allows the AnchorCheck plugin to be
+        # used when checking files. The anchor is stripped in UrlBase.set_cache_url()
+        # if AnchorCheck is not being used.
+
     def build_base_url(self):
         """The URL is normed according to the platform:
          - the base URL is made an absolute *file://* URL
@@ -171,14 +179,15 @@ class FileUrl(urlbase.UrlBase):
             urlparts[3] = ''
             self.base_url = urlutil.urlunsplit(urlparts)
         super().build_url()
-        # ignore query and fragment url parts for filesystem urls
-        self.urlparts[3] = self.urlparts[4] = ''
+        # ignore query url part for filesystem urls
+        self.urlparts[3] = ''
         if self.is_directory() and not self.urlparts[2].endswith('/'):
             self.add_warning(
                 _("Added trailing slash to directory."), tag=WARN_FILE_MISSING_SLASH
             )
             self.urlparts[2] += '/'
         self.url = urlutil.urlunsplit(self.urlparts)
+        self.url_without_anchor = urlutil.urlunsplit(self.urlparts[:4] + [''])
 
     def add_size_info(self):
         """Get size of file content and modification time from filename path."""
@@ -204,7 +213,7 @@ class FileUrl(urlbase.UrlBase):
         if self.is_directory():
             self.set_result(_("directory"))
         else:
-            url = fileutil.path_safe(self.url)
+            url = fileutil.path_safe(self.url_without_anchor)
             self.url_connection = urllib.request.urlopen(url)
             self.check_case_sensitivity()
 
@@ -270,7 +279,7 @@ class FileUrl(urlbase.UrlBase):
         """
         if self.is_directory():
             return True
-        if firefox.has_sqlite and firefox.extension.search(self.url):
+        if firefox.has_sqlite and firefox.extension.search(self.url_without_anchor):
             return True
         return self.is_content_type_parseable()
 
@@ -278,7 +287,8 @@ class FileUrl(urlbase.UrlBase):
         """Return URL content type, or an empty string if content
         type could not be found."""
         if self.url:
-            self.content_type = mimeutil.guess_mimetype(self.url, read=self.get_content)
+            self.content_type = mimeutil.guess_mimetype(
+                self.url_without_anchor, read=self.get_content)
         else:
             self.content_type = ""
 
diff --git a/tests/checker/test_anchor.py b/tests/checker/test_anchor.py
index 7848e9e1..186ca05d 100644
--- a/tests/checker/test_anchor.py
+++ b/tests/checker/test_anchor.py
@@ -27,18 +27,18 @@ class TestAnchor(LinkCheckTest):
 
     def test_anchor(self):
         confargs = {"enabledplugins": ["AnchorCheck"]}
-        url = "file://%(curdir)s/%(datadir)s/anchor.html" % self.get_attrs()
-        nurl = self.norm(url)
         anchor = "broken"
-        urlanchor = url + "#" + anchor
+        url = "file://%(curdir)s/%(datadir)s/anchor.html#%(anchor)s" % self.get_attrs(
+               anchor=anchor)
+        nurl = self.norm(url)
         resultlines = [
-            "url %s" % urlanchor,
+            "url %s" % url,
             "cache key %s" % nurl,
             "real url %s" % nurl,
             "warning Anchor `%s' not found. Available anchors: `myid:'." % anchor,
             "valid",
         ]
-        self.direct(urlanchor, resultlines, confargs=confargs)
+        self.direct(url, resultlines, confargs=confargs)
 
 
 class TestHttpAnchor(HttpServerTest):