diff --git a/src/common/StaggeredLogger.hxx b/src/common/StaggeredLogger.hxx
index 597df4b82..7f93e60e0 100644
--- a/src/common/StaggeredLogger.hxx
+++ b/src/common/StaggeredLogger.hxx
@@ -21,6 +21,7 @@
 #include <functional>
 #include <chrono>
 #include <thread>
+#include <mutex>
 
 #include "bspf.hxx"