diff --git a/src/fuse_open.cpp b/src/fuse_open.cpp
index 785bc008..44a6f958 100644
--- a/src/fuse_open.cpp
+++ b/src/fuse_open.cpp
@@ -34,6 +34,7 @@
 #include <set>
 #include <string>
 #include <vector>
+#include <mutex>
 
 struct PT
 {