diff --git a/src/libslic3r/TriangleMeshSlicer.cpp b/src/libslic3r/TriangleMeshSlicer.cpp
index 565cfcb8b9..681ec32f03 100644
--- a/src/libslic3r/TriangleMeshSlicer.cpp
+++ b/src/libslic3r/TriangleMeshSlicer.cpp
@@ -9,6 +9,7 @@
 #include <cmath>
 #include <deque>
 #include <queue>
+#include <mutex>
 #include <utility>
 
 #include <boost/log/trivial.hpp>