diff --git a/src/libutil/logging.cc b/src/libutil/logging.cc
index d674c9651..53460f729 100644
--- a/src/libutil/logging.cc
+++ b/src/libutil/logging.cc
@@ -7,6 +7,7 @@
 
 #include <algorithm>
 #include <atomic>
+#include <mutex>
 #include <sstream>
 #include <nlohmann/json.hpp>