diff --git a/uppsrc/Core/Core.h b/uppsrc/Core/Core.h
index 230ef88..7889f80 100644
Index: uppsrc/Core/Core.h
===================================================================
--- uppsrc/Core/Core.h
+++ uppsrc/Core/Core.h
@@ -168,6 +168,7 @@
 
 #include <algorithm>
 #include <string>
+#include <complex>
 
 // fix MSC8 beta problem....
 #ifdef COMPILER_MSC
@@ -240,6 +241,7 @@ NAMESPACE_UPP
 #include "Value.h"
 #include "Gtypes.h"
 #include "Color.h"
+#include "Complex.h"
 
 #include "Uuid.h"
 #include "Ptr.h"
diff --git a/uppsrc/Core/Core.upp b/uppsrc/Core/Core.upp
index b023f79..7e0c3f7 100644
Index: uppsrc/Core/Core.upp
===================================================================
--- uppsrc/Core/Core.upp
+++ uppsrc/Core/Core.upp
@@ -107,6 +107,8 @@ file
 	Color.cpp optimize_speed,
 	Gtypes.h,
 	Gtypes.cpp optimize_speed,
+	Complex.h,
+	Complex.cpp,
 	Language readonly separator,
 	i18n.h,
 	t.cpp optimize_speed,