diff --git a/distrho/src/DistrhoUIInternal.hpp b/distrho/src/DistrhoUIInternal.hpp
index 742ea537..041981d5 100644
--- a/distrho/src/DistrhoUIInternal.hpp
+++ b/distrho/src/DistrhoUIInternal.hpp
@@ -286,10 +286,10 @@ public:
 #ifdef DISTRHO_PLUGIN_TARGET_VST3
     void setWindowSizeForVST3(const uint width, const uint height)
     {
+# if DISTRHO_PLUGIN_HAS_EXTERNAL_UI
         ui->setSize(width, height);
-# if !DISTRHO_PLUGIN_HAS_EXTERNAL_UI
-        // NOTE in external uis, the ui and window refer to the same object
-        uiData->window->setSize(width, height);
+# else
+        uiData->window->setSizeForVST3(width, height);
 # endif
     }
 #endif
diff --git a/distrho/src/DistrhoUIPrivateData.hpp b/distrho/src/DistrhoUIPrivateData.hpp
index 378c15d4..e3e846d4 100644
--- a/distrho/src/DistrhoUIPrivateData.hpp
+++ b/distrho/src/DistrhoUIPrivateData.hpp
@@ -231,6 +231,13 @@ public:
             puglBackendEnter(pData->view);
     }
 
+   #ifdef DISTRHO_PLUGIN_TARGET_VST3
+    void setSizeForVST3(const uint width, const uint height)
+    {
+        puglSetWindowSize(pData->view, width, height);
+    }
+   #endif
+
 protected:
     void onFocus(const bool focus, const DGL_NAMESPACE::CrossingMode mode) override
     {