diff --git a/source/backend/plugin/VstPlugin.cpp b/source/backend/plugin/VstPlugin.cpp
index a557bc6d9..ac2f27e51 100644
--- a/source/backend/plugin/VstPlugin.cpp
+++ b/source/backend/plugin/VstPlugin.cpp
@@ -445,6 +445,7 @@ public:
                 fUI.window = CarlaPluginUI::newX11(this, frontendWinId, false);
 # else
                 msg = "UI is only for systems with X11";
+                (void)frontendWinId; // unused
 # endif
 #elif defined(CARLA_OS_MAC)
 # ifdef __LP64__
diff --git a/source/plugin/carla-native-lv2.cpp b/source/plugin/carla-native-lv2.cpp
index 1196d9e0c..1cf622c26 100644
--- a/source/plugin/carla-native-lv2.cpp
+++ b/source/plugin/carla-native-lv2.cpp
@@ -428,7 +428,7 @@ public:
                     fBufferSize = static_cast<uint32_t>(value);
 
                     if (fDescriptor->dispatcher != nullptr)
-                        fDescriptor->dispatcher(fHandle, PLUGIN_OPCODE_BUFFER_SIZE_CHANGED, 0, fBufferSize, nullptr, 0.0f);
+                        fDescriptor->dispatcher(fHandle, PLUGIN_OPCODE_BUFFER_SIZE_CHANGED, 0, value, nullptr, 0.0f);
                 }
                 else
                     carla_stderr("Host changed maxBlockLength but with wrong value type");
diff --git a/source/utils/CarlaPluginUI.cpp b/source/utils/CarlaPluginUI.cpp
index fdcf6a606..3d2205428 100644
--- a/source/utils/CarlaPluginUI.cpp
+++ b/source/utils/CarlaPluginUI.cpp
@@ -595,7 +595,7 @@ bool CarlaPluginUI::tryTransientWinIdMatch(const uintptr_t pid, const char* cons
     return true;
 #else
     return true;
-    (void)pid;
+    (void)pid; (void)centerUI;
 #endif
 }