diff --git a/dlls/mshtml/nsiface.idl b/dlls/mshtml/nsiface.idl
index 0f7e06680df..f27960a8306 100644
--- a/dlls/mshtml/nsiface.idl
+++ b/dlls/mshtml/nsiface.idl
@@ -1404,7 +1404,7 @@ interface nsIWebNavigation : nsISupports
 ]
 interface nsIPrintSettings : nsISupports
 {
-    typedef struct {} nsMargin;
+    typedef struct { char dummy; } nsMargin;
 
     nsresult SetPrintOptions(PRInt32 aType, PRBool aTurnOnOff);
     nsresult GetPrintOptions(PRInt32 aType, PRBool *_retval);