diff --git a/src/CalcManager/pch.h b/src/CalcManager/pch.h
index c5f39b6d..93846bd6 100644
--- a/src/CalcManager/pch.h
+++ b/src/CalcManager/pch.h
@@ -24,6 +24,5 @@
 #include <list>
 #include <regex>
 #include <unordered_map>
-#include <intsafe.h>
 #include <array>
 #include <ppltasks.h>