diff --git a/events.cpp b/events.cpp
index f1f497e165..b2117489aa 100644
--- a/events.cpp
+++ b/events.cpp
@@ -165,18 +165,34 @@ QVector<QByteArray> s_xcbEerrors({
 
 void Workspace::registerEventFilter(X11EventFilter *filter)
 {
-    if (filter->isGenericEvent())
-        m_genericEventFilters.append(filter);
-    else
-        m_eventFilters.append(filter);
+    if (filter->isGenericEvent()) {
+        m_genericEventFilters.append(new X11EventFilterContainer(filter));
+    } else {
+        m_eventFilters.append(new X11EventFilterContainer(filter));
+    }
+}
+
+static X11EventFilterContainer *takeEventFilter(X11EventFilter *eventFilter,
+                                                QList<QPointer<X11EventFilterContainer>> &list)
+{
+    for (int i = 0; i < list.count(); ++i) {
+        X11EventFilterContainer *container = list.at(i);
+        if (container->filter() == eventFilter) {
+            return list.takeAt(i);
+        }
+    }
+    return nullptr;
 }
 
 void Workspace::unregisterEventFilter(X11EventFilter *filter)
 {
-    if (filter->isGenericEvent())
-        m_genericEventFilters.removeOne(filter);
-    else
-        m_eventFilters.removeOne(filter);
+    X11EventFilterContainer *container = nullptr;
+    if (filter->isGenericEvent()) {
+        container = takeEventFilter(filter, m_genericEventFilters);
+    } else {
+        container = takeEventFilter(filter, m_eventFilters);
+    }
+    delete container;
 }
 
 
@@ -219,13 +235,29 @@ bool Workspace::workspaceEvent(xcb_generic_event_t *e)
     if (eventType == XCB_GE_GENERIC) {
         xcb_ge_generic_event_t *ge = reinterpret_cast<xcb_ge_generic_event_t *>(e);
 
-        foreach (X11EventFilter *filter, m_genericEventFilters) {
+        // We need to make a shadow copy of the event filter list because an activated event
+        // filter may mutate it by removing or installing another event filter.
+        const auto eventFilters = m_genericEventFilters;
+
+        for (X11EventFilterContainer *container : eventFilters) {
+            if (!container) {
+                continue;
+            }
+            X11EventFilter *filter = container->filter();
             if (filter->extension() == ge->extension && filter->genericEventTypes().contains(ge->event_type) && filter->event(e)) {
                 return true;
             }
         }
     } else {
-        foreach (X11EventFilter *filter, m_eventFilters) {
+        // We need to make a shadow copy of the event filter list because an activated event
+        // filter may mutate it by removing or installing another event filter.
+        const auto eventFilters = m_eventFilters;
+
+        for (X11EventFilterContainer *container : eventFilters) {
+            if (!container) {
+                continue;
+            }
+            X11EventFilter *filter = container->filter();
             if (filter->eventTypes().contains(eventType) && filter->event(e)) {
                 return true;
             }
diff --git a/workspace.cpp b/workspace.cpp
index 6aa71fc486..fbc35a8b9b 100644
--- a/workspace.cpp
+++ b/workspace.cpp
@@ -66,6 +66,16 @@ namespace KWin
 extern int screen_number;
 extern bool is_multihead;
 
+X11EventFilterContainer::X11EventFilterContainer(X11EventFilter *filter)
+    : m_filter(filter)
+{
+}
+
+X11EventFilter *X11EventFilterContainer::filter() const
+{
+    return m_filter;
+}
+
 ColorMapper::ColorMapper(QObject *parent)
     : QObject(parent)
     , m_default(kwinApp()->x11DefaultScreen()->default_colormap)
diff --git a/workspace.h b/workspace.h
index 489d7bae4a..61fb215a85 100644
--- a/workspace.h
+++ b/workspace.h
@@ -55,6 +55,19 @@ class X11Client;
 class X11EventFilter;
 enum class Predicate;
 
+class X11EventFilterContainer : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit X11EventFilterContainer(X11EventFilter *filter);
+
+    X11EventFilter *filter() const;
+
+private:
+    X11EventFilter *m_filter;
+};
+
 class KWIN_EXPORT Workspace : public QObject
 {
     Q_OBJECT
@@ -654,8 +667,8 @@ private:
 
     QScopedPointer<KillWindow> m_windowKiller;
 
-    QList<X11EventFilter *> m_eventFilters;
-    QList<X11EventFilter *> m_genericEventFilters;
+    QList<QPointer<X11EventFilterContainer>> m_eventFilters;
+    QList<QPointer<X11EventFilterContainer>> m_genericEventFilters;
     QScopedPointer<X11EventFilter> m_movingClientFilter;
     QScopedPointer<X11EventFilter> m_syncAlarmFilter;