diff --git a/src/myx/qt/posix_signal_watcher.cpp b/src/myx/qt/posix_signal_watcher.cpp
index b0d8f9b..a084347 100644
--- a/src/myx/qt/posix_signal_watcher.cpp
+++ b/src/myx/qt/posix_signal_watcher.cpp
@@ -2,6 +2,7 @@
 #define MYX_QT_POSIX_SIGNAL_WATCHER_CPP_
 
 #include <myx/core/config.hpp>
+#include <myx/backports/cpp/helpers.hpp>
 
 #include <myx/qt/posix_signal_watcher.hpp>
 #include <myx/qt/posix_signal_watcher_p.hpp>