diff --git a/bootfiles/18c/boot6.lisp b/bootfiles/18c/boot6.lisp
index d95d2122162f334f4b8dc69b1c563cce5a14172a..8e6d19844a1807ecd51ac0fa3a4b1629e0afaffe 100644
--- a/bootfiles/18c/boot6.lisp
+++ b/bootfiles/18c/boot6.lisp
@@ -1,10 +1,8 @@
 ;; Bootstrap the pseudo-atomic trap genesis change to put
 ;; trap_PseudoAtomic into internals.h.
 #+sparc
-(load "target:code/exports.lisp")
-
-(in-package :sparc)
-
-#+sparc
-(defconstant pseudo-atomic-trap 16)
+(progn
+  (load "target:code/exports.lisp")
+  (in-package :sparc)
+  (defconstant pseudo-atomic-trap 16))