diff --git a/reactos/dll/win32/msi/msi.rbuild b/reactos/dll/win32/msi/msi.rbuild
index 63f26126f1d..3b381f9771b 100644
--- a/reactos/dll/win32/msi/msi.rbuild
+++ b/reactos/dll/win32/msi/msi.rbuild
@@ -5,8 +5,7 @@
 	<include base="ReactOS">include/reactos/wine</include>
 	<define name="__REACTOS__" />
 	<define name="__USE_W32API" />
-	<define name="UNICODE" />
-	<define name="_UNICODE" />
+	<define name="__WINESRC__" />
 	<define name="_WIN32_IE">0x600</define>
 	<define name="_WIN32_WINNT">0x501</define>
 	<define name="WINVER">0x501</define>