diff --git a/gfx/idl/makefile.win b/gfx/idl/makefile.win
index 066205129ae..dabb961c0d4 100644
--- a/gfx/idl/makefile.win
+++ b/gfx/idl/makefile.win
@@ -31,6 +31,7 @@ XPIDLSRCS =               \
   .\nsIScriptableRegion.idl          \
   .\nsIScreen.idl          \
   .\nsIScreenManager.idl          \
+  .\nsIPrintOptions.idl     \
   $(NULL)
 
 EXPORTS=                  \