diff --git a/src/libs/utils/fileutils.cpp b/src/libs/utils/fileutils.cpp
index f9bb024e994..5df793bbc9e 100644
--- a/src/libs/utils/fileutils.cpp
+++ b/src/libs/utils/fileutils.cpp
@@ -44,6 +44,7 @@
 #endif
 
 #ifdef Q_OS_WIN
+#define CALLBACK WINAPI
 #include <qt_windows.h>
 #include <shlobj.h>
 #endif
diff --git a/src/libs/utils/qtcprocess.cpp b/src/libs/utils/qtcprocess.cpp
index 6384aef7d39..b1c05fc4676 100644
--- a/src/libs/utils/qtcprocess.cpp
+++ b/src/libs/utils/qtcprocess.cpp
@@ -36,6 +36,7 @@
 #include <QStack>
 
 #ifdef Q_OS_WIN
+#define CALLBACK WINAPI
 #include <qt_windows.h>
 #else
 #include <errno.h>
diff --git a/src/plugins/coreplugin/progressmanager/progressmanager_win.cpp b/src/plugins/coreplugin/progressmanager/progressmanager_win.cpp
index 91026268630..7f353b0e227 100644
--- a/src/plugins/coreplugin/progressmanager/progressmanager_win.cpp
+++ b/src/plugins/coreplugin/progressmanager/progressmanager_win.cpp
@@ -41,6 +41,7 @@
 
 // for windows progress bar
 #ifndef __GNUC__
+#    define CALLBACK WINAPI
 #    include <shobjidl.h>
 #endif
 
diff --git a/src/plugins/debugger/registerpostmortemaction.cpp b/src/plugins/debugger/registerpostmortemaction.cpp
index 3a7facbaf91..ac9e8c53fbb 100644
--- a/src/plugins/debugger/registerpostmortemaction.cpp
+++ b/src/plugins/debugger/registerpostmortemaction.cpp
@@ -31,6 +31,7 @@
 #include <QDir>
 #include <QString>
 
+#define CALLBACK WINAPI
 #include <windows.h>
 #include <objbase.h>
 #include <shellapi.h>
diff --git a/src/shared/qtcreator_pch.h b/src/shared/qtcreator_pch.h
index 3106ca5ba35..4f93238efba 100644
--- a/src/shared/qtcreator_pch.h
+++ b/src/shared/qtcreator_pch.h
@@ -50,6 +50,9 @@
 #undef ERROR
 #undef ABSOLUTE
 
+// LLVM 12 comes with CALLBACK as a template argument
+#undef CALLBACK
+
 #define _POSIX_
 #include <limits.h>
 #undef _POSIX_