diff --git a/autotests/integration/shell_client_test.cpp b/autotests/integration/shell_client_test.cpp
--- a/autotests/integration/shell_client_test.cpp
+++ b/autotests/integration/shell_client_test.cpp
@@ -556,9 +556,7 @@
     shellSurface->setTitle(origTitle);
     auto c = Test::renderAndWaitForShown(surface.data(), QSize(100, 50), Qt::blue);
     QVERIFY(c);
-    QEXPECT_FAIL("", "BUG 323798", Continue);
     QVERIFY(c->caption() != origTitle);
-    QEXPECT_FAIL("", "BUG 323798", Continue);
     QCOMPARE(c->caption(), origTitle.simplified());
 }
 
diff --git a/autotests/integration/x11_client_test.cpp b/autotests/integration/x11_client_test.cpp
--- a/autotests/integration/x11_client_test.cpp
+++ b/autotests/integration/x11_client_test.cpp
@@ -111,9 +111,7 @@
     Client *client = windowCreatedSpy.first().first().value<Client*>();
     QVERIFY(client);
     QCOMPARE(client->window(), w);
-    QEXPECT_FAIL("", "BUG 323798", Continue);
     QVERIFY(client->caption() != QString::fromUtf8(origTitle));
-    QEXPECT_FAIL("", "BUG 323798", Continue);
     QCOMPARE(client->caption(), QString::fromUtf8(origTitle).simplified());
 
     // and destroy the window again
diff --git a/client.cpp b/client.cpp
--- a/client.cpp
+++ b/client.cpp
@@ -1417,9 +1417,9 @@
 QString Client::readName() const
 {
     if (info->name() && info->name()[0] != '\0')
-        return QString::fromUtf8(info->name());
+        return QString::fromUtf8(info->name()).simplified();
     else
-        return KWindowSystem::readNameProperty(window(), XCB_ATOM_WM_NAME);
+        return KWindowSystem::readNameProperty(window(), XCB_ATOM_WM_NAME).simplified();
 }
 
 // The list is taken from http://www.unicode.org/reports/tr9/ (#154840)
diff --git a/shell_client.cpp b/shell_client.cpp
--- a/shell_client.cpp
+++ b/shell_client.cpp
@@ -90,12 +90,12 @@
 template <class T>
 void ShellClient::initSurface(T *shellSurface)
 {
-    m_caption = shellSurface->title();
+    m_caption = shellSurface->title().simplified();
     connect(shellSurface, &T::titleChanged, this, &ShellClient::captionChanged);
     connect(shellSurface, &T::destroyed, this, &ShellClient::destroyClient);
     connect(shellSurface, &T::titleChanged, this,
         [this] (const QString &s) {
-            m_caption = s;
+            m_caption = s.simplified();
             emit captionChanged();
         }
     );