diff -Nru VST_SDK.orig/VST3_SDK/pluginterfaces/base/funknown.cpp VST_SDK/VST3_SDK/pluginterfaces/base/funknown.cpp
--- VST_SDK.orig/VST3_SDK/pluginterfaces/base/funknown.cpp	2019-12-02 13:58:41.000000000 +0100
+++ VST_SDK/VST3_SDK/pluginterfaces/base/funknown.cpp	2020-03-10 22:02:26.220911670 +0100
@@ -84,7 +84,7 @@
 int32 PLUGIN_API atomicAdd (int32& var, int32 d)
 {
 #if SMTG_OS_WINDOWS
-	return InterlockedExchangeAdd (&var, d) + d;
+	return InterlockedExchangeAdd ((LONG*)&var, d) + d;
 #elif SMTG_OS_MACOS
 #if SMTG_MACOS_USE_STDATOMIC
 	return atomic_fetch_add (reinterpret_cast<atomic_int_least32_t*> (&var), d) + d;