diff --git a/libsrc/meshing/meshclass.cpp b/libsrc/meshing/meshclass.cpp
index f5414e35..6e55b845 100644
--- a/libsrc/meshing/meshclass.cpp
+++ b/libsrc/meshing/meshclass.cpp
@@ -1,4 +1,5 @@
 #include <mystdlib.h>
+#include <atomic>
 #include "meshing.hpp"
 
 namespace netgen