diff --git a/src/ctimepoint.cpp b/src/ctimepoint.cpp
index bf69c22..311319e 100644
--- a/src/ctimepoint.cpp
+++ b/src/ctimepoint.cpp
@@ -25,6 +25,8 @@
 #include "main.h"
 #include "ctimepoint.h"
 
+#include <thread>
+
 ////////////////////////////////////////////////////////////////////////////////////////
 // constructor