diff --git a/src/nasal_vm.h b/src/nasal_vm.h
index 73be5ff..43e6644 100644
--- a/src/nasal_vm.h
+++ b/src/nasal_vm.h
@@ -4,6 +4,7 @@
 #include <stack>
 #include <cstring>
 #include <sstream>
+#include <atomic>
 
 #include "nasal_import.h"
 #include "nasal_gc.h"