diff --git a/src/util/kmodifierkeyinfoprovider.cpp b/src/util/kmodifierkeyinfoprovider.cpp
index c619ee6..448c45b 100644
--- a/src/util/kmodifierkeyinfoprovider.cpp
+++ b/src/util/kmodifierkeyinfoprovider.cpp
@@ -1,104 +1,107 @@
 /*
     Copyright 2009  Michael Leupold <lemma@confuego.org>
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) version 3, or any
     later version accepted by the membership of KDE e.V. (or its
     successor approved by the membership of KDE e.V.), which shall
     act as a proxy defined in Section 6 of version 3 of the license.
 
     This library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
 
     You should have received a copy of the GNU Lesser General Public
     License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include "kmodifierkeyinfoprovider_p.h"
 
 KModifierKeyInfoProvider::KModifierKeyInfoProvider()
     : QObject(nullptr)
 {
 }
 
 KModifierKeyInfoProvider::~KModifierKeyInfoProvider()
 {
 }
 
 bool KModifierKeyInfoProvider::setKeyLatched(Qt::Key key, bool latched)
 {
     Q_UNUSED(key);
     Q_UNUSED(latched);
     return false;
 }
 
 bool KModifierKeyInfoProvider::setKeyLocked(Qt::Key key, bool locked)
 {
     Q_UNUSED(key);
     Q_UNUSED(locked);
     return false;
 }
 
 bool KModifierKeyInfoProvider::isKeyPressed(Qt::Key key) const
 {
-    if (m_modifierStates.contains(key)) {
-        return m_modifierStates[key] & Pressed;
+    auto it = m_modifierStates.constFind(key);
+    if (it != m_modifierStates.constEnd()) {
+        return *it & Pressed;
     }
     return false;
 }
 
 bool KModifierKeyInfoProvider::isKeyLatched(Qt::Key key) const
 {
-    if (m_modifierStates.contains(key)) {
-        return m_modifierStates[key] & Latched;
+    auto it = m_modifierStates.constFind(key);
+    if (it != m_modifierStates.constEnd()) {
+        return *it & Latched;
     }
     return false;
 }
 
 bool KModifierKeyInfoProvider::isKeyLocked(Qt::Key key) const
 {
-    if (m_modifierStates.contains(key)) {
-        return m_modifierStates[key] & Locked;
+    auto it = m_modifierStates.constFind(key);
+    if (it != m_modifierStates.constEnd()) {
+        return *it & Locked;
     }
     return false;
 }
 
 bool KModifierKeyInfoProvider::isButtonPressed(Qt::MouseButton button) const
 {
     if (m_buttonStates.contains(button)) {
         return m_buttonStates[button];
     }
     return false;
 }
 
 bool KModifierKeyInfoProvider::knowsKey(Qt::Key key) const
 {
     return m_modifierStates.contains(key);
 }
 
 const QList<Qt::Key> KModifierKeyInfoProvider::knownKeys() const
 {
     return m_modifierStates.keys();
 }
 
 void KModifierKeyInfoProvider::stateUpdated(Qt::Key key, KModifierKeyInfoProvider::ModifierStates newState)
 {
     auto &state = m_modifierStates[key];
     if (newState != state) {
         const auto difference = (newState ^ state);
         state = newState;
         if (difference & Pressed) {
             emit keyPressed(key, newState & Pressed);
         }
         if (difference & Latched) {
             emit keyLatched(key, newState & Latched);
         }
         if (difference & Locked) {
             emit keyLocked(key, newState & Locked);
         }
     }
 }