diff --git a/build/pdp10-kl/boot b/build/pdp10-kl/boot
index f60d3e64..5b0417bc 100644
--- a/build/pdp10-kl/boot
+++ b/build/pdp10-kl/boot
@@ -14,6 +14,7 @@ set dtc dis
 set dk dis
 set pd off
 at mta0 out/pdp10-kl/minsrc.tape
+set rpa0 rp04
 at rpa0 out/pdp10-kl/rp04.0
 load -i bin/kl10/boot/@.ddt
 go
diff --git a/build/pdp10-kl/boot2 b/build/pdp10-kl/boot2
index 58d68aed..0ae9bc56 100644
--- a/build/pdp10-kl/boot2
+++ b/build/pdp10-kl/boot2
@@ -17,6 +17,9 @@ set pd on
 set mta mpx=7
 set mta type=b
 at mta0 out/pdp10-kl/sources.tape
+set rpa0 rp04
+set rpa1 rp04
+set rpa2 rp04
 at rpa0 out/pdp10-kl/rp04.0
 at rpa1 out/pdp10-kl/rp04.1
 at rpa2 out/pdp10-kl/rp04.2
diff --git a/build/pdp10-kl/init b/build/pdp10-kl/init
index 6d1c9273..795fd5f5 100644
--- a/build/pdp10-kl/init
+++ b/build/pdp10-kl/init
@@ -14,7 +14,9 @@ set dtc dis
 set dk dis
 at mta0 out/pdp10-kl/kl-magdmp.tap
 at mta5 out/pdp10-kl/kl-minsys.tape
-set rpa rp04
+set rpa0 rp04
+set rpa1 rp04
+set rpa2 rp04
 at rpa0 out/pdp10-kl/rp04.0
 at rpa1 out/pdp10-kl/rp04.1
 at rpa2 out/pdp10-kl/rp04.2
diff --git a/build/pdp10-kl/run b/build/pdp10-kl/run
index c2587bfc..8afcdb8e 100644
--- a/build/pdp10-kl/run
+++ b/build/pdp10-kl/run
@@ -17,7 +17,9 @@ set pd ena
 set pd on
 set mta mpx=7
 set mta type=b
-set rpa rp04
+set rpa0 rp04
+set rpa1 rp04
+set rpa2 rp04
 at rpa0 out/pdp10-kl/rp04.0
 at rpa1 out/pdp10-kl/rp04.1
 at rpa2 out/pdp10-kl/rp04.2