diff --git a/src/plugins/cppeditor/baseeditordocumentprocessor.cpp b/src/plugins/cppeditor/baseeditordocumentprocessor.cpp
index 63ade2d3f74..c6c51675eb9 100644
--- a/src/plugins/cppeditor/baseeditordocumentprocessor.cpp
+++ b/src/plugins/cppeditor/baseeditordocumentprocessor.cpp
@@ -12,6 +12,8 @@
 
 #include <texteditor/quickfix.h>
 
+#include <QPromise>
+
 namespace CppEditor {
 
 /*!
diff --git a/src/plugins/cppeditor/baseeditordocumentprocessor.h b/src/plugins/cppeditor/baseeditordocumentprocessor.h
index 5f341c06d96..78c0f55aabc 100644
--- a/src/plugins/cppeditor/baseeditordocumentprocessor.h
+++ b/src/plugins/cppeditor/baseeditordocumentprocessor.h
@@ -23,6 +23,11 @@
 
 #include <functional>
 
+QT_BEGIN_NAMESPACE
+template <typename T>
+class QPromise;
+QT_END_NAMESPACE
+
 namespace TextEditor { class TextDocument; }
 
 namespace CppEditor {