diff --git a/platformsupport/scenes/opengl/abstract_egl_backend.cpp b/platformsupport/scenes/opengl/abstract_egl_backend.cpp
--- a/platformsupport/scenes/opengl/abstract_egl_backend.cpp
+++ b/platformsupport/scenes/opengl/abstract_egl_backend.cpp
@@ -391,6 +391,12 @@
     if (image.isNull() || !s) {
         return;
     }
+    if (image.size() != m_size) {
+        // buffer size has changed, reload shm texture
+        if (!loadTexture(pixmap)) {
+            return;
+        }
+    }
     Q_ASSERT(image.size() == m_size);
     q->bind();
     const QRegion damage = s->trackedDamage();