diff --git a/reactos/subsys/system/calc/calc.xml b/reactos/subsys/system/calc/calc.xml
index 0b02cad9f52..d87b3790eed 100644
--- a/reactos/subsys/system/calc/calc.xml
+++ b/reactos/subsys/system/calc/calc.xml
@@ -2,6 +2,7 @@
 	<include base="calc">.</include>
 	<define name="__USE_W32API" />
 	<define name="_WIN32_IE">0x0501</define>
+	<define name="WINVER">0x0501</define>
 	<define name="UNICODE" />
 	<define name="_UNICODE" />
 	<library>kernel32</library>