diff --git a/etc/ps-prin3.ps b/etc/ps-prin3.ps
index 9e916e81c44..44fea8fec9a 100644
--- a/etc/ps-prin3.ps
+++ b/etc/ps-prin3.ps
@@ -2,7 +2,7 @@
 
 % --- duplex feature verification
 UseSetpagedevice {
-  << /Duplex DuplexValue /Tumble TumbleValue >> setpagedevice
+  BMark /Duplex DuplexValue /Tumble TumbleValue EMark setpagedevice
 }{
   statusdict begin
    DuplexValue setduplexmode TumbleValue settumble