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-rw-r--r--src/corelib/global/q20functional.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/corelib/global/q20functional.h b/src/corelib/global/q20functional.h
index 787b3ec0357..13e6c9e0904 100644
--- a/src/corelib/global/q20functional.h
+++ b/src/corelib/global/q20functional.h
@@ -23,6 +23,8 @@
// We mean it.
//
+#include <functional>
+
QT_BEGIN_NAMESPACE
namespace q20 {