diff --git a/build/misc.tcl b/build/misc.tcl
index 80b8d0f4..2688affc 100644
--- a/build/misc.tcl
+++ b/build/misc.tcl
@@ -832,16 +832,9 @@ respond "*" ":midas sys1;ts pty_sysen1;pty\r"
 expect ":KILL"
 
 # PRUFD
-respond "*" ":midas sysbin;prufd bin_sysen2;prufd\r"
+respond "*" ":midas sys1;ts prufd_sysen2;prufd\r"
 expect ":KILL"
 
-# patch PRUFD to use the TTY: device rather than the LPT: device
-respond "*" ":job prufd\r"
-respond "*" ":load sysbin;prufd bin\r"
-respond "*" "nlinks+14/ A,,646471\r"
-type ":pdump sys1;ts prufd\r"
-respond "*" ":kill\r"
-
 # udir
 respond "*" ":midas sys3;ts nudir_sysen3; nudir\r"
 expect ":KILL"
diff --git a/src/sysen2/prufd.10 b/src/sysen2/prufd.11
similarity index 99%
rename from src/sysen2/prufd.10
rename to src/sysen2/prufd.11
index cba6c33d..6c263239 100644
--- a/src/sysen2/prufd.10
+++ b/src/sysen2/prufd.11
@@ -62,7 +62,7 @@ PDL:	BLOCK LPDL+1
 
 		;INITIALIZE
 
-PRINI:	.OPEN LPTC,[1,,SIXBIT /   LPTPRUFD WPAPER/]
+PRINI:	.OPEN LPTC,[1,,SIXBIT /   TTYPRUFD WPAPER/]
 	.VALUE		;LPT NOT AVAILABLE
 	IRPS NAME,,[USER BLOCKS LINKS]
 	MOVE AA,[SIXBIT /NAME/]