diff --git a/src/VisualizerWidget.cpp b/src/VisualizerWidget.cpp
index 101d308..4a411fa 100644
--- a/src/VisualizerWidget.cpp
+++ b/src/VisualizerWidget.cpp
@@ -384,9 +384,11 @@ void VisualizerWidget::render(QRhiCommandBuffer *cb) {
   int w = width();
   int h = height();
 
-  // Only rebuild vertices when new data has arrived
-  if (m_dataDirty) {
+  // Rebuild vertices when new data arrived or widget was resized
+  if (m_dataDirty || w != m_lastBuildW || h != m_lastBuildH) {
     m_dataDirty = false;
+    m_lastBuildW = w;
+    m_lastBuildH = h;
     if (m_mirrored) {
       buildVertices(w * 0.55f, h / 2);
       buildCepstrumVertices(w, h);
diff --git a/src/VisualizerWidget.h b/src/VisualizerWidget.h
index 86d9e69..1ae95ce 100644
--- a/src/VisualizerWidget.h
+++ b/src/VisualizerWidget.h
@@ -68,6 +68,8 @@ private:
     int m_targetFps = 60;
     qint64 m_lastFrameTime = 0;
     bool m_dataDirty = false;
+    int m_lastBuildW = 0;
+    int m_lastBuildH = 0;
 
     // RHI resources
     QRhi *m_rhi = nullptr;