diff --git a/src/corelib/tools/qflatmap_p.h b/src/corelib/tools/qflatmap_p.h
index 590b0d942f4..82a1068d34d 100644
--- a/src/corelib/tools/qflatmap_p.h
+++ b/src/corelib/tools/qflatmap_p.h
@@ -60,6 +60,7 @@
 #include <numeric>
 #include <type_traits>
 #include <utility>
+#include <vector>
 
 QT_BEGIN_NAMESPACE