diff --git a/distrho/src/DistrhoPluginVST.cpp b/distrho/src/DistrhoPluginVST.cpp
index d8e7640f..12752306 100644
--- a/distrho/src/DistrhoPluginVST.cpp
+++ b/distrho/src/DistrhoPluginVST.cpp
@@ -588,7 +588,8 @@ public:
             return 1;
 
         case effEditOpen:
-            if (fVstUI == nullptr)
+            delete fVstUI; // hosts which don't pair effEditOpen/effEditClose calls (Minihost Modular)
+            fVstUI = nullptr;
             {
 # if DISTRHO_OS_MAC
                 if (! fUsingNsView)