diff --git a/shell_client.cpp b/shell_client.cpp
--- a/shell_client.cpp
+++ b/shell_client.cpp
@@ -810,6 +810,9 @@
 
 bool ShellClient::isMovable() const
 {
+    if (isFullScreen()) {
+        return false;
+    }
     if (rules()->checkPosition(invalidPoint) != invalidPoint) {
         return false;
     }
@@ -838,6 +841,9 @@
 
 bool ShellClient::isResizable() const
 {
+    if (isFullScreen()) {
+        return false;
+    }
     if (rules()->checkSize(QSize()).isValid()) {
         return false;
     }