diff --git a/source/backend/plugin/CarlaPluginJack.cpp b/source/backend/plugin/CarlaPluginJack.cpp
index 3fc82976c..954e296ae 100644
--- a/source/backend/plugin/CarlaPluginJack.cpp
+++ b/source/backend/plugin/CarlaPluginJack.cpp
@@ -294,7 +294,9 @@ protected:
 
             const ScopedEngineEnvironmentLocker _seel(kEngine);
 
+#ifdef HAVE_LIBLO
             const ScopedEnvVar sev3("NSM_URL", lo_server_get_url(fOscServer));
+#endif
             const ScopedEnvVar sev2("LD_LIBRARY_PATH", libjackdir.buffer());
             const ScopedEnvVar sev1("LD_PRELOAD", ldpreload.isNotEmpty() ? ldpreload.buffer() : nullptr);