diff --git a/source/backend/engine/CarlaEngineBridge.cpp b/source/backend/engine/CarlaEngineBridge.cpp
index 1546c6c2b..b88c5ddd0 100644
--- a/source/backend/engine/CarlaEngineBridge.cpp
+++ b/source/backend/engine/CarlaEngineBridge.cpp
@@ -1096,9 +1096,27 @@ public:
                     plugin->showCustomUI(false);
                 break;
 
+            case kPluginBridgeNonRtClientEmbedUI: {
+                const uint64_t winId = fShmNonRtClientControl.readULong();
+                uint64_t resp = 0;
+
+                if (plugin->isEnabled())
+                    resp = reinterpret_cast<uint64_t>(plugin->embedCustomUI(reinterpret_cast<void*>(winId)));
+
+                if (resp == 0)
+                    resp = 1;
+
+                const CarlaMutexLocker _cml(fShmNonRtServerControl.mutex);
+
+                fShmNonRtServerControl.writeOpcode(kPluginBridgeNonRtServerEmbedUI);
+                fShmNonRtServerControl.writeULong(reinterpret_cast<uint64_t>(resp));
+                fShmNonRtServerControl.commitWrite();
+                break;
+            }
+
             case kPluginBridgeNonRtClientUiParameterChange: {
-                const uint32_t index(fShmNonRtClientControl.readUInt());
-                const float    value(fShmNonRtClientControl.readFloat());
+                const uint32_t index = fShmNonRtClientControl.readUInt();
+                const float    value = fShmNonRtClientControl.readFloat();
 
                 if (plugin->isEnabled())
                     plugin->uiParameterChange(index, value);
diff --git a/source/backend/plugin/CarlaPluginBridge.cpp b/source/backend/plugin/CarlaPluginBridge.cpp
index 25b11b030..c29d18b02 100644
--- a/source/backend/plugin/CarlaPluginBridge.cpp
+++ b/source/backend/plugin/CarlaPluginBridge.cpp
@@ -420,6 +420,7 @@ public:
           fTimedError(false),
           fBufferSize(engine->getBufferSize()),
           fProcWaitTime(0),
+          fPendingEmbedCustomUI(0),
           fBridgeBinary(),
           fBridgeThread(engine, this),
           fShmAudioPool(),
@@ -1036,6 +1037,44 @@ public:
 #endif
     }
 
+    void* embedCustomUI(void* const ptr) override
+    {
+        if (fBridgeVersion < 9)
+            return nullptr;
+
+        fPendingEmbedCustomUI = 0;
+
+        {
+            const CarlaMutexLocker _cml(fShmNonRtClientControl.mutex);
+
+            fShmNonRtClientControl.writeOpcode(kPluginBridgeNonRtClientEmbedUI);
+            fShmNonRtClientControl.writeULong(reinterpret_cast<uint64_t>(ptr));
+            fShmNonRtClientControl.commitWrite();
+        }
+
+        const uint32_t timeoutEnd = Time::getMillisecondCounter() + 15*1000; // 15 secs
+        const bool needsEngineIdle = pData->engine->getType() != kEngineTypePlugin;
+
+        for (; Time::getMillisecondCounter() < timeoutEnd && fBridgeThread.isThreadRunning();)
+        {
+            pData->engine->callback(true, true, ENGINE_CALLBACK_IDLE, 0, 0, 0, 0, 0.0f, nullptr);
+
+            if (needsEngineIdle)
+                pData->engine->idle();
+
+            if (fPendingEmbedCustomUI != 0)
+            {
+                if (fPendingEmbedCustomUI == 1)
+                    fPendingEmbedCustomUI = 0;
+                break;
+            }
+
+            carla_msleep(20);
+        }
+
+        return reinterpret_cast<void*>(fPendingEmbedCustomUI);
+    }
+
     void idle() override
     {
         if (fBridgeThread.isThreadRunning())
@@ -2093,6 +2132,9 @@ public:
                 pData->hints   = hints | PLUGIN_IS_BRIDGE;
                 pData->options = optionEn;
 
+                if (fBridgeVersion < 9)
+                    pData->hints &= ~PLUGIN_HAS_CUSTOM_EMBED_UI;
+
                 fInfo.category = static_cast<PluginCategory>(category);
                 fInfo.optionsAvailable = optionAv;
             }   break;
@@ -2520,6 +2562,10 @@ public:
                 fSaved = true;
                 break;
 
+            case kPluginBridgeNonRtServerEmbedUI:
+                fPendingEmbedCustomUI = fShmNonRtServerControl.readULong();
+                break;
+
             case kPluginBridgeNonRtServerUiClosed:
 #ifndef BUILD_BRIDGE_ALTERNATIVE_ARCH
                 pData->transientTryCounter = 0;
@@ -2792,6 +2838,7 @@ private:
     bool fTimedError;
     uint fBufferSize;
     uint fProcWaitTime;
+    uint64_t fPendingEmbedCustomUI;
 
     CarlaString             fBridgeBinary;
     CarlaPluginBridgeThread fBridgeThread;
diff --git a/source/backend/plugin/CarlaPluginJack.cpp b/source/backend/plugin/CarlaPluginJack.cpp
index 7ddc14035..01562b381 100644
--- a/source/backend/plugin/CarlaPluginJack.cpp
+++ b/source/backend/plugin/CarlaPluginJack.cpp
@@ -1533,6 +1533,7 @@ public:
             case kPluginBridgeNonRtServerMidiProgramData:
             case kPluginBridgeNonRtServerSetCustomData:
             case kPluginBridgeNonRtServerVersion:
+            case kPluginBridgeNonRtServerEmbedUI:
                 break;
 
             case kPluginBridgeNonRtServerSetChunkDataFile:
diff --git a/source/backend/plugin/CarlaPluginVST2.cpp b/source/backend/plugin/CarlaPluginVST2.cpp
index fd6c73765..efe42e57b 100644
--- a/source/backend/plugin/CarlaPluginVST2.cpp
+++ b/source/backend/plugin/CarlaPluginVST2.cpp
@@ -1009,6 +1009,7 @@ public:
 #endif
             {
                 pData->hints |= PLUGIN_HAS_CUSTOM_UI;
+                pData->hints |= PLUGIN_HAS_CUSTOM_EMBED_UI;
             }
 
             pData->hints |= PLUGIN_NEEDS_UI_MAIN_THREAD;
diff --git a/source/utils/CarlaBridgeDefines.hpp b/source/utils/CarlaBridgeDefines.hpp
index b36d6a2d9..f83e5c668 100644
--- a/source/utils/CarlaBridgeDefines.hpp
+++ b/source/utils/CarlaBridgeDefines.hpp
@@ -24,7 +24,7 @@
 #define CARLA_PLUGIN_BRIDGE_API_VERSION_MINIMUM 6
 
 // current API version, bumped when something is added
-#define CARLA_PLUGIN_BRIDGE_API_VERSION_CURRENT 8
+#define CARLA_PLUGIN_BRIDGE_API_VERSION_CURRENT 9
 
 // -------------------------------------------------------------------------------------------------------------------
 
@@ -79,6 +79,8 @@ enum PluginBridgeNonRtClientOpcode {
     kPluginBridgeNonRtClientSetOptions,                     // uint
     // stuff added in API 8
     kPluginBridgeNonRtClientSetWindowTitle,                 // uint/size, str[]
+    // stuff added in API 9
+    kPluginBridgeNonRtClientEmbedUI,                        // ulong
 };
 
 // Client sends these to server during non-RT
@@ -114,7 +116,9 @@ enum PluginBridgeNonRtServerOpcode {
     kPluginBridgeNonRtServerUiClosed,
     kPluginBridgeNonRtServerError,              // uint/size, str[]
     // stuff added in API 7
-    kPluginBridgeNonRtServerVersion             // uint
+    kPluginBridgeNonRtServerVersion,            // uint
+    // stuff added in API 9
+    kPluginBridgeNonRtServerEmbedUI,            // ulong
 };
 
 // used for kPluginBridgeNonRtServerPortName
diff --git a/source/utils/CarlaBridgeUtils.hpp b/source/utils/CarlaBridgeUtils.hpp
index e8b9f506c..3ef6de902 100644
--- a/source/utils/CarlaBridgeUtils.hpp
+++ b/source/utils/CarlaBridgeUtils.hpp
@@ -127,6 +127,8 @@ const char* PluginBridgeNonRtClientOpcode2str(const PluginBridgeNonRtClientOpcod
         return "kPluginBridgeNonRtClientSetOptions";
     case kPluginBridgeNonRtClientSetWindowTitle:
         return "kPluginBridgeNonRtClientSetWindowTitle";
+    case kPluginBridgeNonRtClientEmbedUI:
+        return "kPluginBridgeNonRtClientEmbedUI";
     }
 
     carla_stderr("CarlaBackend::PluginBridgeNonRtClientOpcode2str(%i) - invalid opcode", opcode);
@@ -200,6 +202,8 @@ const char* PluginBridgeNonRtServerOpcode2str(const PluginBridgeNonRtServerOpcod
         return "kPluginBridgeNonRtServerError";
     case kPluginBridgeNonRtServerVersion:
         return "kPluginBridgeNonRtServerVersion";
+    case kPluginBridgeNonRtServerEmbedUI:
+        return "kPluginBridgeNonRtServerEmbedUI";
     }
 
     carla_stderr("CarlaBackend::PluginBridgeNonRtServerOpcode2str%i) - invalid opcode", opcode);