diff --git a/abstract_client.h b/abstract_client.h
--- a/abstract_client.h
+++ b/abstract_client.h
@@ -456,7 +456,16 @@
     */
     bool isCurrentTab() const;
     virtual QRect geometryRestore() const = 0;
+    /**
+     * The currently applied maximize mode
+     */
     virtual MaximizeMode maximizeMode() const = 0;
+    /**
+     * The maximise mode requested by the server.
+     * For X this always matches maximizeMode, for wayland clients it
+     * is asyncronous
+     */
+    virtual MaximizeMode requestedMaximizeMode() const;
     void maximize(MaximizeMode);
     void setMaximize(bool vertically, bool horizontally);
     virtual bool noBorder() const = 0;
diff --git a/abstract_client.cpp b/abstract_client.cpp
--- a/abstract_client.cpp
+++ b/abstract_client.cpp
@@ -204,6 +204,11 @@
     return !tab_group || tab_group->current() == this;
 }
 
+MaximizeMode AbstractClient::requestedMaximizeMode() const
+{
+    return maximizeMode();
+}
+
 xcb_timestamp_t AbstractClient::userTime() const
 {
     return XCB_TIME_CURRENT_TIME;
diff --git a/decorations/decoratedclient.cpp b/decorations/decoratedclient.cpp
--- a/decorations/decoratedclient.cpp
+++ b/decorations/decoratedclient.cpp
@@ -271,7 +271,7 @@
 
 bool DecoratedClientImpl::isMaximizedVertically() const
 {
-    return m_client->maximizeMode() & MaximizeVertical;
+    return m_client->requestedMaximizeMode() & MaximizeVertical;
 }
 
 bool DecoratedClientImpl::isMaximized() const
@@ -281,7 +281,7 @@
 
 bool DecoratedClientImpl::isMaximizedHorizontally() const
 {
-    return m_client->maximizeMode() & MaximizeHorizontal;
+    return m_client->requestedMaximizeMode() & MaximizeHorizontal;
 }
 
 Qt::Edges DecoratedClientImpl::adjacentScreenEdges() const
diff --git a/shell_client.h b/shell_client.h
--- a/shell_client.h
+++ b/shell_client.h
@@ -95,6 +95,8 @@
     }
     void hideClient(bool hide) override;
     MaximizeMode maximizeMode() const override;
+    MaximizeMode requestedMaximizeMode() const override;
+
     QRect geometryRestore() const override {
         return m_geomMaximizeRestore;
     }
diff --git a/shell_client.cpp b/shell_client.cpp
--- a/shell_client.cpp
+++ b/shell_client.cpp
@@ -914,6 +914,11 @@
     return m_maximizeMode;
 }
 
+MaximizeMode ShellClient::requestedMaximizeMode() const
+{
+    return m_requestedMaximizeMode;
+}
+
 bool ShellClient::noBorder() const
 {
     if (isInternal()) {