diff --git a/src/libs/clangbackendipc/cancelmessage.cpp b/src/libs/clangbackendipc/cancelmessage.cpp
index 470b8263c71..015f65324ce 100644
--- a/src/libs/clangbackendipc/cancelmessage.cpp
+++ b/src/libs/clangbackendipc/cancelmessage.cpp
@@ -27,6 +27,8 @@
 
 #include <QDebug>
 
+#include <ostream>
+
 namespace ClangBackEnd {
 
 QDebug operator<<(QDebug debug, const CancelMessage &)