diff --git a/qutebrowser/browser/adblock.py b/qutebrowser/browser/adblock.py
index e38b44d5f..862ec18fa 100644
--- a/qutebrowser/browser/adblock.py
+++ b/qutebrowser/browser/adblock.py
@@ -173,15 +173,12 @@ class HostBlocker:
         for url in config.val.content.host_blocking.lists:
             if url.scheme() == 'file':
                 filename = url.toLocalFile()
-                try:
-                    fileobj = open(filename, 'rb')
-                except OSError as e:
-                    message.error("adblock: Error while reading {}: {}".format(
-                        filename, e.strerror))
-                    continue
-                download = _FakeDownload(fileobj)
-                self._in_progress.append(download)
-                self._on_download_finished(download)
+                if os.path.isdir(filename):
+                    for filenames in os.scandir(filename):
+                        if filenames.is_file():
+                            self._import_local(filenames.path)
+                else:
+                    self._import_local(filename)
             else:
                 fobj = io.BytesIO()
                 fobj.name = 'adblock: ' + url.host()
@@ -192,6 +189,22 @@ class HostBlocker:
                 download.finished.connect(
                     functools.partial(self._on_download_finished, download))
 
+    def _import_local(self, filename):
+        """Adds the contents of a file to the blocklist.
+
+        Args:
+            filename: path to a local file to import.
+        """
+        try:
+            fileobj = open(filename, 'rb')
+        except OSError as e:
+            message.error("adblock: Error while reading {}: {}".format(
+                filename, e.strerror))
+            return
+        download = _FakeDownload(fileobj)
+        self._in_progress.append(download)
+        self._on_download_finished(download)
+
     def _parse_line(self, line):
         """Parse a line from a host file.
 
diff --git a/tests/unit/browser/test_adblock.py b/tests/unit/browser/test_adblock.py
index 470bce5cd..8bcbf3eb6 100644
--- a/tests/unit/browser/test_adblock.py
+++ b/tests/unit/browser/test_adblock.py
@@ -434,3 +434,22 @@ def test_config_change(config_stub, basedir, download_stub,
     host_blocker.read_hosts()
     for str_url in URLS_TO_CHECK:
         assert not host_blocker.is_blocked(QUrl(str_url))
+
+
+def test_add_directory(config_stub, basedir, download_stub,
+                       data_tmpdir, tmpdir):
+    """Ensure adblocker can import all files in a directory."""
+    blocklist_hosts2 = []
+    for i in BLOCKLIST_HOSTS[1:]:
+        blocklist_hosts2.append('1' + i)
+
+    create_blocklist(tmpdir, blocked_hosts=BLOCKLIST_HOSTS,
+                     name='blocked-hosts', line_format='one_per_line')
+    create_blocklist(tmpdir, blocked_hosts=blocklist_hosts2,
+                     name='blocked-hosts2', line_format='one_per_line')
+
+    config_stub.val.content.host_blocking.lists = [tmpdir.strpath]
+    config_stub.val.content.host_blocking.enabled = True
+    host_blocker = adblock.HostBlocker()
+    host_blocker.adblock_update()
+    assert len(host_blocker._blocked_hosts) == len(blocklist_hosts2) * 2