diff --git a/source/backend/plugin/CarlaPluginDSSI.cpp b/source/backend/plugin/CarlaPluginDSSI.cpp
index a7ffc52f3..181edace7 100644
--- a/source/backend/plugin/CarlaPluginDSSI.cpp
+++ b/source/backend/plugin/CarlaPluginDSSI.cpp
@@ -26,6 +26,7 @@
 
 #ifdef HAVE_LIBLO
 # include "CarlaOscUtils.hpp"
+# include "CarlaPipeUtils.hpp"
 # include "CarlaThread.hpp"
 #endif
 
@@ -146,55 +147,33 @@ public:
 
         {
 #ifdef CARLA_OS_LINUX
-            const ScopedEngineEnvironmentLocker _seel(kEngine);
+            /*
+             * If the frontend uses winId parent, set LD_PRELOAD to auto-map the DSSI UI.
+             * If not, unset LD_PRELOAD.
+             */
+            const uintptr_t winId(kEngine->getOptions().frontendWinId);
 
-            // get current LD_PRELOAD, will restore it later
-            const char* const oldPreload(std::getenv("LD_PRELOAD"));
+            // for CARLA_ENGINE_OPTION_FRONTEND_WIN_ID
+            char winIdStr[STR_MAX+1];
+            winIdStr[STR_MAX] = '\0';
 
-# ifdef HAVE_X11
-            // if the frontend uses winId parent, set LD_PRELOAD to auto-map the DSSI UI
-            const uintptr_t winId = kEngine->getOptions().frontendWinId;
+            // for LD_PRELOAD
+            CarlaString ldPreloadValue;
 
             if (winId != 0)
             {
-                char strBuf[STR_MAX+1];
-                strBuf[STR_MAX] = '\0';
-                std::snprintf(strBuf, STR_MAX, P_UINTPTR, kEngine->getOptions().frontendWinId);
-                ::setenv("CARLA_ENGINE_OPTION_FRONTEND_WIN_ID", strBuf, 1);
-
-                CarlaString interposerPath(CarlaString(kEngine->getOptions().binaryDir) +
-                                           CARLA_OS_SEP_STR "libcarla_interposer-x11.so");
-                ::setenv("LD_PRELOAD", interposerPath.buffer(), 1);
+                std::snprintf(winIdStr, STR_MAX, P_UINTPTR, kEngine->getOptions().frontendWinId);
+                ldPreloadValue = (CarlaString(kEngine->getOptions().binaryDir) + CARLA_OS_SEP_STR "libcarla_interposer-x11.so");
             }
-            else
-# else
-            // if no X11 or winId set, simply unset LD_PRELOAD
-            // (it might be set to libcarla_interposer-safe)
-            if (oldPreload != nullptr)
-                ::unsetenv("LD_PRELOAD");
-# endif
+
+            const ScopedEngineEnvironmentLocker _seel(kEngine);
+            const ScopedEnvVar _sev1("CARLA_ENGINE_OPTION_FRONTEND_WIN_ID", winIdStr[0] != '\0' ? winIdStr : nullptr);
+            const ScopedEnvVar _sev2("LD_PRELOAD", ldPreloadValue.isNotEmpty() ? ldPreloadValue.buffer() : nullptr);
 #endif // CARLA_OS_LINUX
 
             // start the DSSI UI application
             carla_stdout("starting DSSI UI...");
             started = fProcess->start(arguments);
-
-#ifdef CARLA_OS_LINUX
-            // restore initial state
-            if (oldPreload != nullptr)
-            {
-                ::setenv("LD_PRELOAD", oldPreload, 1);
-            }
-# ifdef HAVE_X11
-            if (winId != 0)
-            {
-                ::unsetenv("CARLA_ENGINE_OPTION_FRONTEND_WIN_ID");
-
-                if (oldPreload == nullptr)
-                    ::unsetenv("LD_PRELOAD");
-            }
-# endif
-#endif // CARLA_OS_LINUX
         }
 
         if (! started)