diff --git a/qutebrowser/javascript/pac_utils.js b/qutebrowser/javascript/pac_utils.js
index a6102df9f..b4540c18a 100644
--- a/qutebrowser/javascript/pac_utils.js
+++ b/qutebrowser/javascript/pac_utils.js
@@ -78,7 +78,7 @@ function isInNet(ipaddr, pattern, maskstr) {
 }
 
 function isPlainHostName(host) {
-    return (host.search('\\\\.') == -1);
+    return (host.search('\\.') == -1);
 }
 
 function isResolvable(host) {
diff --git a/tests/unit/browser/webkit/network/test_pac.py b/tests/unit/browser/webkit/network/test_pac.py
index dc9229dbf..e52b4e7ec 100644
--- a/tests/unit/browser/webkit/network/test_pac.py
+++ b/tests/unit/browser/webkit/network/test_pac.py
@@ -109,6 +109,15 @@ def test_myIpAddress():
     _pac_equality_test("isResolvable(myIpAddress())", "true")
 
 
+@pytest.mark.parametrize("host, expected", [
+    ("example", "true"),
+    ("example.com", "false"),
+    ("www.example.com", "false"),
+])
+def test_isPlainHostName(host, expected):
+    _pac_equality_test("isPlainHostName('{}')".format(host), expected)
+
+
 def test_proxyBindings():
     _pac_equality_test("JSON.stringify(ProxyConfig.bindings)", "'{}'")