diff --git a/src/lib/util/un7z.cpp b/src/lib/util/un7z.cpp
index 8b73faed49b..bca825c1f71 100644
--- a/src/lib/util/un7z.cpp
+++ b/src/lib/util/un7z.cpp
@@ -25,6 +25,7 @@
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
+#include <mutex>
 #include <utility>
 #include <vector>