diff --git a/src/plugins/projectexplorer/iprojectpanelfactory.h b/src/plugins/projectexplorer/iprojectpanelfactory.h
index e6e43d9f546..20f84dc81d9 100644
--- a/src/plugins/projectexplorer/iprojectpanelfactory.h
+++ b/src/plugins/projectexplorer/iprojectpanelfactory.h
@@ -38,6 +38,8 @@
 #include <QIcon>
 #include <QWidget>
 
+#include <functional>
+
 namespace ProjectExplorer {
 class Project;
 class Target;